Moving scripts and utilities into a new utilities dir

18 files changed, 0 insertions, 4677 deletions

diff --git a/hash_script/node_modules/node-fetch/.npmignore b/hash_script/node_modules/node-fetch/.npmignore
deleted file mode 100644
index a9cb254..0000000
--- a/hash_script/node_modules/node-fetch/.npmignore
+++ /dev/null
@@ -1,41 +0,0 @@
-# Logs
-logs
-*.log
-
-# Runtime data
-pids
-*.pid
-*.seed
-
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Compiled binary addons (http://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directory
-# Commenting this out is preferred by some people, see
-# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git-
-node_modules
-
-# Users Environment Variables
-.lock-wscript
-
-# OS files
-.DS_Store
-
-# Coveralls token files
-.coveralls.yml
-
-## ignore some files from 2.x branch
-
-.nyc_output
-lib/index.js
-lib/index.es.js
-package-lock.json
diff --git a/hash_script/node_modules/node-fetch/.travis.yml b/hash_script/node_modules/node-fetch/.travis.yml
deleted file mode 100644
index 44b72f0..0000000
--- a/hash_script/node_modules/node-fetch/.travis.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-language: node_js
-node_js:
-  - "0.10"
-  - "0.12"
-  - "node"
-env:
-  - FORMDATA_VERSION=1.0.0
-  - FORMDATA_VERSION=2.1.0
-before_script:
-  - 'if [ "$FORMDATA_VERSION" ]; then npm install form-data@^$FORMDATA_VERSION; fi'
-before_install: if [[ `npm -v` < 3 ]]; then npm install -g npm@1.4.28; fi
-script: npm run coverage
\ No newline at end of file
diff --git a/hash_script/node_modules/node-fetch/CHANGELOG.md b/hash_script/node_modules/node-fetch/CHANGELOG.md
deleted file mode 100644
index ea8ebe7..0000000
--- a/hash_script/node_modules/node-fetch/CHANGELOG.md
+++ /dev/null
@@ -1,158 +0,0 @@
-
-Changelog
-=========
-
-
-# 1.x release
-
-(Note: `1.x` will only have backported bugfix releases beyond `1.7.0`)
-
-## v1.7.2
-
-- Fix: when using node-fetch with test framework such as `jest`, `instanceof` check could fail in `Headers` class. This is causing some header values, such as `set-cookie`, to be dropped incorrectly.
-
-## v1.7.1
-
-- Fix: close local test server properly under Node 8.
-
-## v1.7.0
-
-- Fix: revert change in `v1.6.2` where 204 no-content response is handled with a special case, this conflicts with browser Fetch implementation (as browsers always throw when res.json() parses an empty string). Since this is an operational error, it's wrapped in a `FetchError` for easier error handling.
-- Fix: move code coverage tool to codecov platform and update travis config
-
-## v1.6.3
-
-- Enhance: error handling document to explain `FetchError` design
-- Fix: support `form-data` 2.x releases (requires `form-data` >= 2.1.0)
-
-## v1.6.2
-
-- Enhance: minor document update
-- Fix: response.json() returns empty object on 204 no-content response instead of throwing a syntax error
-
-## v1.6.1
-
-- Fix: if `res.body` is a non-stream non-formdata object, we will call `body.toString` and send it as a string
-- Fix: `counter` value is incorrectly set to `follow` value when wrapping Request instance
-- Fix: documentation update
-
-## v1.6.0
-
-- Enhance: added `res.buffer()` api for convenience, it returns body as a Node.js buffer
-- Enhance: better old server support by handling raw deflate response
-- Enhance: skip encoding detection for non-HTML/XML response
-- Enhance: minor document update
-- Fix: HEAD request doesn't need decompression, as body is empty
-- Fix: `req.body` now accepts a Node.js buffer
-
-## v1.5.3
-
-- Fix: handle 204 and 304 responses when body is empty but content-encoding is gzip/deflate
-- Fix: allow resolving response and cloned response in any order
-- Fix: avoid setting `content-length` when `form-data` body use streams
-- Fix: send DELETE request with content-length when body is present
-- Fix: allow any url when calling new Request, but still reject non-http(s) url in fetch
-
-## v1.5.2
-
-- Fix: allow node.js core to handle keep-alive connection pool when passing a custom agent
-
-## v1.5.1
-
-- Fix: redirect mode `manual` should work even when there is no redirection or broken redirection
-
-## v1.5.0
-
-- Enhance: rejected promise now use custom `Error` (thx to @pekeler)
-- Enhance: `FetchError` contains `err.type` and `err.code`, allows for better error handling (thx to @pekeler)
-- Enhance: basic support for redirect mode `manual` and `error`, allows for location header extraction (thx to @jimmywarting for the initial PR)
-
-## v1.4.1
-
-- Fix: wrapping Request instance with FormData body again should preserve the body as-is
-
-## v1.4.0
-
-- Enhance: Request and Response now have `clone` method (thx to @kirill-konshin for the initial PR)
-- Enhance: Request and Response now have proper string and buffer body support (thx to @kirill-konshin)
-- Enhance: Body constructor has been refactored out (thx to @kirill-konshin)
-- Enhance: Headers now has `forEach` method (thx to @tricoder42)
-- Enhance: back to 100% code coverage
-- Fix: better form-data support (thx to @item4)
-- Fix: better character encoding detection under chunked encoding (thx to @dsuket for the initial PR)
-
-## v1.3.3
-
-- Fix: make sure `Content-Length` header is set when body is string for POST/PUT/PATCH requests
-- Fix: handle body stream error, for cases such as incorrect `Content-Encoding` header
-- Fix: when following certain redirects, use `GET` on subsequent request per Fetch Spec
-- Fix: `Request` and `Response` constructors now parse headers input using `Headers`
-
-## v1.3.2
-
-- Enhance: allow auto detect of form-data input (no `FormData` spec on node.js, this is form-data specific feature)
-
-## v1.3.1
-
-- Enhance: allow custom host header to be set (server-side only feature, as it's a forbidden header on client-side)
-
-## v1.3.0
-
-- Enhance: now `fetch.Request` is exposed as well
-
-## v1.2.1
-
-- Enhance: `Headers` now normalized `Number` value to `String`, prevent common mistakes
-
-## v1.2.0
-
-- Enhance: now fetch.Headers and fetch.Response are exposed, making testing easier
-
-## v1.1.2
-
-- Fix: `Headers` should only support `String` and `Array` properties, and ignore others
-
-## v1.1.1
-
-- Enhance: now req.headers accept both plain object and `Headers` instance
-
-## v1.1.0
-
-- Enhance: timeout now also applies to response body (in case of slow response)
-- Fix: timeout is now cleared properly when fetch is done/has failed
-
-## v1.0.6
-
-- Fix: less greedy content-type charset matching
-
-## v1.0.5
-
-- Fix: when `follow = 0`, fetch should not follow redirect
-- Enhance: update tests for better coverage
-- Enhance: code formatting
-- Enhance: clean up doc
-
-## v1.0.4
-
-- Enhance: test iojs support
-- Enhance: timeout attached to socket event only fire once per redirect
-
-## v1.0.3
-
-- Fix: response size limit should reject large chunk
-- Enhance: added character encoding detection for xml, such as rss/atom feed (encoding in DTD)
-
-## v1.0.2
-
-- Fix: added res.ok per spec change
-
-## v1.0.0
-
-- Enhance: better test coverage and doc
-
-
-# 0.x release
-
-## v0.1
-
-- Major: initial public release
diff --git a/hash_script/node_modules/node-fetch/ERROR-HANDLING.md b/hash_script/node_modules/node-fetch/ERROR-HANDLING.md
deleted file mode 100644
index 0e4025d..0000000
--- a/hash_script/node_modules/node-fetch/ERROR-HANDLING.md
+++ /dev/null
@@ -1,21 +0,0 @@
-
-Error handling with node-fetch
-==============================
-
-Because `window.fetch` isn't designed to transparent about the cause of request errors, we have to come up with our own solutions.
-
-The basics:
-
-- All [operational errors](https://www.joyent.com/node-js/production/design/errors) are rejected as [FetchError](https://github.com/bitinn/node-fetch/blob/master/lib/fetch-error.js), you can handle them all through promise `catch` clause.
-
-- All errors comes with `err.message` detailing the cause of errors.
-
-- All errors originated from `node-fetch` are marked with custom `err.type`.
-
-- All errors originated from Node.js core are marked with `err.type = system`, and contains addition `err.code` and `err.errno` for error handling, they are alias to error codes thrown by Node.js core.
-
-- [Programmer errors](https://www.joyent.com/node-js/production/design/errors) are either thrown as soon as possible, or rejected with default `Error` with `err.message` for ease of troubleshooting.
-
-List of error types:
-
-- Because we maintain 100% coverage, see [test.js](https://github.com/bitinn/node-fetch/blob/master/test/test.js) for a full list of custom `FetchError` types, as well as some of the common errors from Node.js
diff --git a/hash_script/node_modules/node-fetch/LICENSE.md b/hash_script/node_modules/node-fetch/LICENSE.md
deleted file mode 100644
index 660ffec..0000000
--- a/hash_script/node_modules/node-fetch/LICENSE.md
+++ /dev/null
@@ -1,22 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2016 David Frank
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-
diff --git a/hash_script/node_modules/node-fetch/LIMITS.md b/hash_script/node_modules/node-fetch/LIMITS.md
deleted file mode 100644
index d0d41fc..0000000
--- a/hash_script/node_modules/node-fetch/LIMITS.md
+++ /dev/null
@@ -1,27 +0,0 @@
-
-Known differences
-=================
-
-*As of 1.x release*
-
-- Topics such as Cross-Origin, Content Security Policy, Mixed Content, Service Workers are ignored, given our server-side context.
-
-- URL input must be an absolute URL, using either `http` or `https` as scheme.
-
-- On the upside, there are no forbidden headers, and `res.url` contains the final url when following redirects.
-
-- For convenience, `res.body` is a transform stream, so decoding can be handled independently.
-
-- Similarly, `req.body` can either be a string, a buffer or a readable stream.
-
-- Also, you can handle rejected fetch requests through checking `err.type` and `err.code`.
-
-- Only support `res.text()`, `res.json()`, `res.buffer()` at the moment, until there are good use-cases for blob/arrayBuffer.
-
-- There is currently no built-in caching, as server-side caching varies by use-cases.
-
-- Current implementation lacks server-side cookie store, you will need to extract `Set-Cookie` headers manually.
-
-- If you are using `res.clone()` and writing an isomorphic app, note that stream on Node.js have a smaller internal buffer size (16Kb, aka `highWaterMark`) from client-side browsers (>1Mb, not consistent across browsers).
-
-- ES6 features such as `headers.entries()` are missing at the moment, but you can use `headers.raw()` to retrieve the raw headers object.
diff --git a/hash_script/node_modules/node-fetch/README.md b/hash_script/node_modules/node-fetch/README.md
deleted file mode 100644
index 0bfb387..0000000
--- a/hash_script/node_modules/node-fetch/README.md
+++ /dev/null
@@ -1,210 +0,0 @@
-
-node-fetch
-==========
-
-[![npm version][npm-image]][npm-url]
-[![build status][travis-image]][travis-url]
-[![coverage status][codecov-image]][codecov-url]
-
-A light-weight module that brings `window.fetch` to Node.js
-
-
-# Motivation
-
-Instead of implementing `XMLHttpRequest` in Node.js to run browser-specific [Fetch polyfill](https://github.com/github/fetch), why not go from native `http` to `Fetch` API directly? Hence `node-fetch`, minimal code for a `window.fetch` compatible API on Node.js runtime.
-
-See Matt Andrews' [isomorphic-fetch](https://github.com/matthew-andrews/isomorphic-fetch) for isomorphic usage (exports `node-fetch` for server-side, `whatwg-fetch` for client-side).
-
-
-# Features
-
-- Stay consistent with `window.fetch` API.
-- Make conscious trade-off when following [whatwg fetch spec](https://fetch.spec.whatwg.org/) and [stream spec](https://streams.spec.whatwg.org/) implementation details, document known difference.
-- Use native promise, but allow substituting it with [insert your favorite promise library].
-- Use native stream for body, on both request and response.
-- Decode content encoding (gzip/deflate) properly, and convert string output (such as `res.text()` and `res.json()`) to UTF-8 automatically.
-- Useful extensions such as timeout, redirect limit, response size limit, [explicit errors](https://github.com/bitinn/node-fetch/blob/master/ERROR-HANDLING.md) for troubleshooting.
-
-
-# Difference from client-side fetch
-
-- See [Known Differences](https://github.com/bitinn/node-fetch/blob/master/LIMITS.md) for details.
-- If you happen to use a missing feature that `window.fetch` offers, feel free to open an issue.
-- Pull requests are welcomed too!
-
-
-# Install
-
-`npm install node-fetch --save`
-
-
-# Usage
-
-```javascript
-var fetch = require('node-fetch');
-
-// if you are on node v0.10, set a Promise library first, eg.
-// fetch.Promise = require('bluebird');
-
-// plain text or html
-
-fetch('https://github.com/')
-	.then(function(res) {
-		return res.text();
-	}).then(function(body) {
-		console.log(body);
-	});
-
-// json
-
-fetch('https://api.github.com/users/github')
-	.then(function(res) {
-		return res.json();
-	}).then(function(json) {
-		console.log(json);
-	});
-
-// catching network error
-// 3xx-5xx responses are NOT network errors, and should be handled in then()
-// you only need one catch() at the end of your promise chain
-
-fetch('http://domain.invalid/')
-	.catch(function(err) {
-		console.log(err);
-	});
-
-// stream
-// the node.js way is to use stream when possible
-
-fetch('https://assets-cdn.github.com/images/modules/logos_page/Octocat.png')
-	.then(function(res) {
-		var dest = fs.createWriteStream('./octocat.png');
-		res.body.pipe(dest);
-	});
-
-// buffer
-// if you prefer to cache binary data in full, use buffer()
-// note that buffer() is a node-fetch only API
-
-var fileType = require('file-type');
-fetch('https://assets-cdn.github.com/images/modules/logos_page/Octocat.png')
-	.then(function(res) {
-		return res.buffer();
-	}).then(function(buffer) {
-		fileType(buffer);
-	});
-
-// meta
-
-fetch('https://github.com/')
-	.then(function(res) {
-		console.log(res.ok);
-		console.log(res.status);
-		console.log(res.statusText);
-		console.log(res.headers.raw());
-		console.log(res.headers.get('content-type'));
-	});
-
-// post
-
-fetch('http://httpbin.org/post', { method: 'POST', body: 'a=1' })
-	.then(function(res) {
-		return res.json();
-	}).then(function(json) {
-		console.log(json);
-	});
-
-// post with stream from resumer
-
-var resumer = require('resumer');
-var stream = resumer().queue('a=1').end();
-fetch('http://httpbin.org/post', { method: 'POST', body: stream })
-	.then(function(res) {
-		return res.json();
-	}).then(function(json) {
-		console.log(json);
-	});
-
-// post with form-data (detect multipart)
-
-var FormData = require('form-data');
-var form = new FormData();
-form.append('a', 1);
-fetch('http://httpbin.org/post', { method: 'POST', body: form })
-	.then(function(res) {
-		return res.json();
-	}).then(function(json) {
-		console.log(json);
-	});
-
-// post with form-data (custom headers)
-// note that getHeaders() is non-standard API
-
-var FormData = require('form-data');
-var form = new FormData();
-form.append('a', 1);
-fetch('http://httpbin.org/post', { method: 'POST', body: form, headers: form.getHeaders() })
-	.then(function(res) {
-		return res.json();
-	}).then(function(json) {
-		console.log(json);
-	});
-
-// node 0.12+, yield with co
-
-var co = require('co');
-co(function *() {
-	var res = yield fetch('https://api.github.com/users/github');
-	var json = yield res.json();
-	console.log(res);
-});
-```
-
-See [test cases](https://github.com/bitinn/node-fetch/blob/master/test/test.js) for more examples.
-
-
-# API
-
-## fetch(url, options)
-
-Returns a `Promise`
-
-### Url
-
-Should be an absolute url, eg `http://example.com/`
-
-### Options
-
-default values are shown, note that only `method`, `headers`, `redirect` and `body` are allowed in `window.fetch`, others are node.js extensions.
-
-```
-{
-	method: 'GET'
-	, headers: {}        // request header. format {a:'1'} or {b:['1','2','3']}
-	, redirect: 'follow' // set to `manual` to extract redirect headers, `error` to reject redirect
-	, follow: 20         // maximum redirect count. 0 to not follow redirect
-	, timeout: 0         // req/res timeout in ms, it resets on redirect. 0 to disable (OS limit applies)
-	, compress: true     // support gzip/deflate content encoding. false to disable
-	, size: 0            // maximum response body size in bytes. 0 to disable
-	, body: empty        // request body. can be a string, buffer, readable stream
-	, agent: null        // http.Agent instance, allows custom proxy, certificate etc.
-}
-```
-
-
-# License
-
-MIT
-
-
-# Acknowledgement
-
-Thanks to [github/fetch](https://github.com/github/fetch) for providing a solid implementation reference.
-
-
-[npm-image]: https://img.shields.io/npm/v/node-fetch.svg?style=flat-square
-[npm-url]: https://www.npmjs.com/package/node-fetch
-[travis-image]: https://img.shields.io/travis/bitinn/node-fetch.svg?style=flat-square
-[travis-url]: https://travis-ci.org/bitinn/node-fetch
-[codecov-image]: https://img.shields.io/codecov/c/github/bitinn/node-fetch.svg?style=flat-square
-[codecov-url]: https://codecov.io/gh/bitinn/node-fetch
diff --git a/hash_script/node_modules/node-fetch/index.js b/hash_script/node_modules/node-fetch/index.js
deleted file mode 100644
index 8f6730d..0000000
--- a/hash_script/node_modules/node-fetch/index.js
+++ /dev/null
@@ -1,271 +0,0 @@
-
-/**
- * index.js
- *
- * a request API compatible with window.fetch
- */
-
-var parse_url = require('url').parse;
-var resolve_url = require('url').resolve;
-var http = require('http');
-var https = require('https');
-var zlib = require('zlib');
-var stream = require('stream');
-
-var Body = require('./lib/body');
-var Response = require('./lib/response');
-var Headers = require('./lib/headers');
-var Request = require('./lib/request');
-var FetchError = require('./lib/fetch-error');
-
-// commonjs
-module.exports = Fetch;
-// es6 default export compatibility
-module.exports.default = module.exports;
-
-/**
- * Fetch class
- *
- * @param   Mixed    url   Absolute url or Request instance
- * @param   Object   opts  Fetch options
- * @return  Promise
- */
-function Fetch(url, opts) {
-
-	// allow call as function
-	if (!(this instanceof Fetch))
-		return new Fetch(url, opts);
-
-	// allow custom promise
-	if (!Fetch.Promise) {
-		throw new Error('native promise missing, set Fetch.Promise to your favorite alternative');
-	}
-
-	Body.Promise = Fetch.Promise;
-
-	var self = this;
-
-	// wrap http.request into fetch
-	return new Fetch.Promise(function(resolve, reject) {
-		// build request object
-		var options = new Request(url, opts);
-
-		if (!options.protocol || !options.hostname) {
-			throw new Error('only absolute urls are supported');
-		}
-
-		if (options.protocol !== 'http:' && options.protocol !== 'https:') {
-			throw new Error('only http(s) protocols are supported');
-		}
-
-		var send;
-		if (options.protocol === 'https:') {
-			send = https.request;
-		} else {
-			send = http.request;
-		}
-
-		// normalize headers
-		var headers = new Headers(options.headers);
-
-		if (options.compress) {
-			headers.set('accept-encoding', 'gzip,deflate');
-		}
-
-		if (!headers.has('user-agent')) {
-			headers.set('user-agent', 'node-fetch/1.0 (+https://github.com/bitinn/node-fetch)');
-		}
-
-		if (!headers.has('connection') && !options.agent) {
-			headers.set('connection', 'close');
-		}
-
-		if (!headers.has('accept')) {
-			headers.set('accept', '*/*');
-		}
-
-		// detect form data input from form-data module, this hack avoid the need to pass multipart header manually
-		if (!headers.has('content-type') && options.body && typeof options.body.getBoundary === 'function') {
-			headers.set('content-type', 'multipart/form-data; boundary=' + options.body.getBoundary());
-		}
-
-		// bring node-fetch closer to browser behavior by setting content-length automatically
-		if (!headers.has('content-length') && /post|put|patch|delete/i.test(options.method)) {
-			if (typeof options.body === 'string') {
-				headers.set('content-length', Buffer.byteLength(options.body));
-			// detect form data input from form-data module, this hack avoid the need to add content-length header manually
-			} else if (options.body && typeof options.body.getLengthSync === 'function') {
-				// for form-data 1.x
-				if (options.body._lengthRetrievers && options.body._lengthRetrievers.length == 0) {
-					headers.set('content-length', options.body.getLengthSync().toString());
-				// for form-data 2.x
-				} else if (options.body.hasKnownLength && options.body.hasKnownLength()) {
-					headers.set('content-length', options.body.getLengthSync().toString());
-				}
-			// this is only necessary for older nodejs releases (before iojs merge)
-			} else if (options.body === undefined || options.body === null) {
-				headers.set('content-length', '0');
-			}
-		}
-
-		options.headers = headers.raw();
-
-		// http.request only support string as host header, this hack make custom host header possible
-		if (options.headers.host) {
-			options.headers.host = options.headers.host[0];
-		}
-
-		// send request
-		var req = send(options);
-		var reqTimeout;
-
-		if (options.timeout) {
-			req.once('socket', function(socket) {
-				reqTimeout = setTimeout(function() {
-					req.abort();
-					reject(new FetchError('network timeout at: ' + options.url, 'request-timeout'));
-				}, options.timeout);
-			});
-		}
-
-		req.on('error', function(err) {
-			clearTimeout(reqTimeout);
-			reject(new FetchError('request to ' + options.url + ' failed, reason: ' + err.message, 'system', err));
-		});
-
-		req.on('response', function(res) {
-			clearTimeout(reqTimeout);
-
-			// handle redirect
-			if (self.isRedirect(res.statusCode) && options.redirect !== 'manual') {
-				if (options.redirect === 'error') {
-					reject(new FetchError('redirect mode is set to error: ' + options.url, 'no-redirect'));
-					return;
-				}
-
-				if (options.counter >= options.follow) {
-					reject(new FetchError('maximum redirect reached at: ' + options.url, 'max-redirect'));
-					return;
-				}
-
-				if (!res.headers.location) {
-					reject(new FetchError('redirect location header missing at: ' + options.url, 'invalid-redirect'));
-					return;
-				}
-
-				// per fetch spec, for POST request with 301/302 response, or any request with 303 response, use GET when following redirect
-				if (res.statusCode === 303
-					|| ((res.statusCode === 301 || res.statusCode === 302) && options.method === 'POST'))
-				{
-					options.method = 'GET';
-					delete options.body;
-					delete options.headers['content-length'];
-				}
-
-				options.counter++;
-
-				resolve(Fetch(resolve_url(options.url, res.headers.location), options));
-				return;
-			}
-
-			// normalize location header for manual redirect mode
-			var headers = new Headers(res.headers);
-			if (options.redirect === 'manual' && headers.has('location')) {
-				headers.set('location', resolve_url(options.url, headers.get('location')));
-			}
-
-			// prepare response
-			var body = res.pipe(new stream.PassThrough());
-			var response_options = {
-				url: options.url
-				, status: res.statusCode
-				, statusText: res.statusMessage
-				, headers: headers
-				, size: options.size
-				, timeout: options.timeout
-			};
-
-			// response object
-			var output;
-
-			// in following scenarios we ignore compression support
-			// 1. compression support is disabled
-			// 2. HEAD request
-			// 3. no content-encoding header
-			// 4. no content response (204)
-			// 5. content not modified response (304)
-			if (!options.compress || options.method === 'HEAD' || !headers.has('content-encoding') || res.statusCode === 204 || res.statusCode === 304) {
-				output = new Response(body, response_options);
-				resolve(output);
-				return;
-			}
-
-			// otherwise, check for gzip or deflate
-			var name = headers.get('content-encoding');
-
-			// for gzip
-			if (name == 'gzip' || name == 'x-gzip') {
-				body = body.pipe(zlib.createGunzip());
-				output = new Response(body, response_options);
-				resolve(output);
-				return;
-
-			// for deflate
-			} else if (name == 'deflate' || name == 'x-deflate') {
-				// handle the infamous raw deflate response from old servers
-				// a hack for old IIS and Apache servers
-				var raw = res.pipe(new stream.PassThrough());
-				raw.once('data', function(chunk) {
-					// see http://stackoverflow.com/questions/37519828
-					if ((chunk[0] & 0x0F) === 0x08) {
-						body = body.pipe(zlib.createInflate());
-					} else {
-						body = body.pipe(zlib.createInflateRaw());
-					}
-					output = new Response(body, response_options);
-					resolve(output);
-				});
-				return;
-			}
-
-			// otherwise, use response as-is
-			output = new Response(body, response_options);
-			resolve(output);
-			return;
-		});
-
-		// accept string, buffer or readable stream as body
-		// per spec we will call tostring on non-stream objects
-		if (typeof options.body === 'string') {
-			req.write(options.body);
-			req.end();
-		} else if (options.body instanceof Buffer) {
-			req.write(options.body);
-			req.end();
-		} else if (typeof options.body === 'object' && options.body.pipe) {
-			options.body.pipe(req);
-		} else if (typeof options.body === 'object') {
-			req.write(options.body.toString());
-			req.end();
-		} else {
-			req.end();
-		}
-	});
-
-};
-
-/**
- * Redirect code matching
- *
- * @param   Number   code  Status code
- * @return  Boolean
- */
-Fetch.prototype.isRedirect = function(code) {
-	return code === 301 || code === 302 || code === 303 || code === 307 || code === 308;
-}
-
-// expose Promise
-Fetch.Promise = global.Promise;
-Fetch.Response = Response;
-Fetch.Headers = Headers;
-Fetch.Request = Request;
diff --git a/hash_script/node_modules/node-fetch/lib/body.js b/hash_script/node_modules/node-fetch/lib/body.js
deleted file mode 100644
index 19bc003..0000000
--- a/hash_script/node_modules/node-fetch/lib/body.js
+++ /dev/null
@@ -1,261 +0,0 @@
-
-/**
- * body.js
- *
- * Body interface provides common methods for Request and Response
- */
-
-var convert = require('encoding').convert;
-var bodyStream = require('is-stream');
-var PassThrough = require('stream').PassThrough;
-var FetchError = require('./fetch-error');
-
-module.exports = Body;
-
-/**
- * Body class
- *
- * @param   Stream  body  Readable stream
- * @param   Object  opts  Response options
- * @return  Void
- */
-function Body(body, opts) {
-
-	opts = opts || {};
-
-	this.body = body;
-	this.bodyUsed = false;
-	this.size = opts.size || 0;
-	this.timeout = opts.timeout || 0;
-	this._raw = [];
-	this._abort = false;
-
-}
-
-/**
- * Decode response as json
- *
- * @return  Promise
- */
-Body.prototype.json = function() {
-
-	var self = this;
-
-	return this._decode().then(function(buffer) {
-		try {
-			return JSON.parse(buffer.toString());
-		} catch (err) {
-			return Body.Promise.reject(new FetchError('invalid json response body at ' + self.url + ' reason: ' + err.message, 'invalid-json'));
-		}
-	});
-
-};
-
-/**
- * Decode response as text
- *
- * @return  Promise
- */
-Body.prototype.text = function() {
-
-	return this._decode().then(function(buffer) {
-		return buffer.toString();
-	});
-
-};
-
-/**
- * Decode response as buffer (non-spec api)
- *
- * @return  Promise
- */
-Body.prototype.buffer = function() {
-
-	return this._decode();
-
-};
-
-/**
- * Decode buffers into utf-8 string
- *
- * @return  Promise
- */
-Body.prototype._decode = function() {
-
-	var self = this;
-
-	if (this.bodyUsed) {
-		return Body.Promise.reject(new Error('body used already for: ' + this.url));
-	}
-
-	this.bodyUsed = true;
-	this._bytes = 0;
-	this._abort = false;
-	this._raw = [];
-
-	return new Body.Promise(function(resolve, reject) {
-		var resTimeout;
-
-		// body is string
-		if (typeof self.body === 'string') {
-			self._bytes = self.body.length;
-			self._raw = [new Buffer(self.body)];
-			return resolve(self._convert());
-		}
-
-		// body is buffer
-		if (self.body instanceof Buffer) {
-			self._bytes = self.body.length;
-			self._raw = [self.body];
-			return resolve(self._convert());
-		}
-
-		// allow timeout on slow response body
-		if (self.timeout) {
-			resTimeout = setTimeout(function() {
-				self._abort = true;
-				reject(new FetchError('response timeout at ' + self.url + ' over limit: ' + self.timeout, 'body-timeout'));
-			}, self.timeout);
-		}
-
-		// handle stream error, such as incorrect content-encoding
-		self.body.on('error', function(err) {
-			reject(new FetchError('invalid response body at: ' + self.url + ' reason: ' + err.message, 'system', err));
-		});
-
-		// body is stream
-		self.body.on('data', function(chunk) {
-			if (self._abort || chunk === null) {
-				return;
-			}
-
-			if (self.size && self._bytes + chunk.length > self.size) {
-				self._abort = true;
-				reject(new FetchError('content size at ' + self.url + ' over limit: ' + self.size, 'max-size'));
-				return;
-			}
-
-			self._bytes += chunk.length;
-			self._raw.push(chunk);
-		});
-
-		self.body.on('end', function() {
-			if (self._abort) {
-				return;
-			}
-
-			clearTimeout(resTimeout);
-			resolve(self._convert());
-		});
-	});
-
-};
-
-/**
- * Detect buffer encoding and convert to target encoding
- * ref: http://www.w3.org/TR/2011/WD-html5-20110113/parsing.html#determining-the-character-encoding
- *
- * @param   String  encoding  Target encoding
- * @return  String
- */
-Body.prototype._convert = function(encoding) {
-
-	encoding = encoding || 'utf-8';
-
-	var ct = this.headers.get('content-type');
-	var charset = 'utf-8';
-	var res, str;
-
-	// header
-	if (ct) {
-		// skip encoding detection altogether if not html/xml/plain text
-		if (!/text\/html|text\/plain|\+xml|\/xml/i.test(ct)) {
-			return Buffer.concat(this._raw);
-		}
-
-		res = /charset=([^;]*)/i.exec(ct);
-	}
-
-	// no charset in content type, peek at response body for at most 1024 bytes
-	if (!res && this._raw.length > 0) {
-		for (var i = 0; i < this._raw.length; i++) {
-			str += this._raw[i].toString()
-			if (str.length > 1024) {
-				break;
-			}
-		}
-		str = str.substr(0, 1024);
-	}
-
-	// html5
-	if (!res && str) {
-		res = /<meta.+?charset=(['"])(.+?)\1/i.exec(str);
-	}
-
-	// html4
-	if (!res && str) {
-		res = /<meta[\s]+?http-equiv=(['"])content-type\1[\s]+?content=(['"])(.+?)\2/i.exec(str);
-
-		if (res) {
-			res = /charset=(.*)/i.exec(res.pop());
-		}
-	}
-
-	// xml
-	if (!res && str) {
-		res = /<\?xml.+?encoding=(['"])(.+?)\1/i.exec(str);
-	}
-
-	// found charset
-	if (res) {
-		charset = res.pop();
-
-		// prevent decode issues when sites use incorrect encoding
-		// ref: https://hsivonen.fi/encoding-menu/
-		if (charset === 'gb2312' || charset === 'gbk') {
-			charset = 'gb18030';
-		}
-	}
-
-	// turn raw buffers into a single utf-8 buffer
-	return convert(
-		Buffer.concat(this._raw)
-		, encoding
-		, charset
-	);
-
-};
-
-/**
- * Clone body given Res/Req instance
- *
- * @param   Mixed  instance  Response or Request instance
- * @return  Mixed
- */
-Body.prototype._clone = function(instance) {
-	var p1, p2;
-	var body = instance.body;
-
-	// don't allow cloning a used body
-	if (instance.bodyUsed) {
-		throw new Error('cannot clone body after it is used');
-	}
-
-	// check that body is a stream and not form-data object
-	// note: we can't clone the form-data object without having it as a dependency
-	if (bodyStream(body) && typeof body.getBoundary !== 'function') {
-		// tee instance body
-		p1 = new PassThrough();
-		p2 = new PassThrough();
-		body.pipe(p1);
-		body.pipe(p2);
-		// set instance body to teed body and return the other teed body
-		instance.body = p1;
-		body = p2;
-	}
-
-	return body;
-}
-
-// expose Promise
-Body.Promise = global.Promise;
diff --git a/hash_script/node_modules/node-fetch/lib/fetch-error.js b/hash_script/node_modules/node-fetch/lib/fetch-error.js
deleted file mode 100644
index 7cabfb3..0000000
--- a/hash_script/node_modules/node-fetch/lib/fetch-error.js
+++ /dev/null
@@ -1,34 +0,0 @@
-
-/**
- * fetch-error.js
- *
- * FetchError interface for operational errors
- */
-
-module.exports = FetchError;
-
-/**
- * Create FetchError instance
- *
- * @param   String      message      Error message for human
- * @param   String      type         Error type for machine
- * @param   String      systemError  For Node.js system error
- * @return  FetchError
- */
-function FetchError(message, type, systemError) {
-
-	// hide custom error implementation details from end-users
-	Error.captureStackTrace(this, this.constructor);
-
-	this.name = this.constructor.name;
-	this.message = message;
-	this.type = type;
-
-	// when err.type is `system`, err.code contains system error code
-	if (systemError) {
-		this.code = this.errno = systemError.code;
-	}
-
-}
-
-require('util').inherits(FetchError, Error);
diff --git a/hash_script/node_modules/node-fetch/lib/headers.js b/hash_script/node_modules/node-fetch/lib/headers.js
deleted file mode 100644
index af20749..0000000
--- a/hash_script/node_modules/node-fetch/lib/headers.js
+++ /dev/null
@@ -1,141 +0,0 @@
-
-/**
- * headers.js
- *
- * Headers class offers convenient helpers
- */
-
-module.exports = Headers;
-
-/**
- * Headers class
- *
- * @param   Object  headers  Response headers
- * @return  Void
- */
-function Headers(headers) {
-
-	var self = this;
-	this._headers = {};
-
-	// Headers
-	if (headers instanceof Headers) {
-		headers = headers.raw();
-	}
-
-	// plain object
-	for (var prop in headers) {
-		if (!headers.hasOwnProperty(prop)) {
-			continue;
-		}
-
-		if (typeof headers[prop] === 'string') {
-			this.set(prop, headers[prop]);
-
-		} else if (typeof headers[prop] === 'number' && !isNaN(headers[prop])) {
-			this.set(prop, headers[prop].toString());
-
-		} else if (Array.isArray(headers[prop])) {
-			headers[prop].forEach(function(item) {
-				self.append(prop, item.toString());
-			});
-		}
-	}
-
-}
-
-/**
- * Return first header value given name
- *
- * @param   String  name  Header name
- * @return  Mixed
- */
-Headers.prototype.get = function(name) {
-	var list = this._headers[name.toLowerCase()];
-	return list ? list[0] : null;
-};
-
-/**
- * Return all header values given name
- *
- * @param   String  name  Header name
- * @return  Array
- */
-Headers.prototype.getAll = function(name) {
-	if (!this.has(name)) {
-		return [];
-	}
-
-	return this._headers[name.toLowerCase()];
-};
-
-/**
- * Iterate over all headers
- *
- * @param   Function  callback  Executed for each item with parameters (value, name, thisArg)
- * @param   Boolean   thisArg   `this` context for callback function
- * @return  Void
- */
-Headers.prototype.forEach = function(callback, thisArg) {
-	Object.getOwnPropertyNames(this._headers).forEach(function(name) {
-		this._headers[name].forEach(function(value) {
-			callback.call(thisArg, value, name, this)
-		}, this)
-	}, this)
-}
-
-/**
- * Overwrite header values given name
- *
- * @param   String  name   Header name
- * @param   String  value  Header value
- * @return  Void
- */
-Headers.prototype.set = function(name, value) {
-	this._headers[name.toLowerCase()] = [value];
-};
-
-/**
- * Append a value onto existing header
- *
- * @param   String  name   Header name
- * @param   String  value  Header value
- * @return  Void
- */
-Headers.prototype.append = function(name, value) {
-	if (!this.has(name)) {
-		this.set(name, value);
-		return;
-	}
-
-	this._headers[name.toLowerCase()].push(value);
-};
-
-/**
- * Check for header name existence
- *
- * @param   String   name  Header name
- * @return  Boolean
- */
-Headers.prototype.has = function(name) {
-	return this._headers.hasOwnProperty(name.toLowerCase());
-};
-
-/**
- * Delete all header values given name
- *
- * @param   String  name  Header name
- * @return  Void
- */
-Headers.prototype['delete'] = function(name) {
-	delete this._headers[name.toLowerCase()];
-};
-
-/**
- * Return raw headers (non-spec api)
- *
- * @return  Object
- */
-Headers.prototype.raw = function() {
-	return this._headers;
-};
diff --git a/hash_script/node_modules/node-fetch/lib/index.js b/hash_script/node_modules/node-fetch/lib/index.js
deleted file mode 100644
index f100854..0000000
--- a/hash_script/node_modules/node-fetch/lib/index.js
+++ /dev/null
@@ -1,1416 +0,0 @@
-'use strict';
-
-Object.defineProperty(exports, '__esModule', { value: true });
-
-// Based on https://github.com/tmpvar/jsdom/blob/aa85b2abf07766ff7bf5c1f6daafb3726f2f2db5/lib/jsdom/living/blob.js
-// (MIT licensed)
-
-const BUFFER = Symbol('buffer');
-const TYPE = Symbol('type');
-const CLOSED = Symbol('closed');
-
-class Blob {
-	constructor() {
-		Object.defineProperty(this, Symbol.toStringTag, {
-			value: 'Blob',
-			writable: false,
-			enumerable: false,
-			configurable: true
-		});
-
-		this[CLOSED] = false;
-		this[TYPE] = '';
-
-		const blobParts = arguments[0];
-		const options = arguments[1];
-
-		const buffers = [];
-
-		if (blobParts) {
-			const a = blobParts;
-			const length = Number(a.length);
-			for (let i = 0; i < length; i++) {
-				const element = a[i];
-				let buffer;
-				if (element instanceof Buffer) {
-					buffer = element;
-				} else if (ArrayBuffer.isView(element)) {
-					buffer = Buffer.from(element.buffer, element.byteOffset, element.byteLength);
-				} else if (element instanceof ArrayBuffer) {
-					buffer = Buffer.from(element);
-				} else if (element instanceof Blob) {
-					buffer = element[BUFFER];
-				} else {
-					buffer = Buffer.from(typeof element === 'string' ? element : String(element));
-				}
-				buffers.push(buffer);
-			}
-		}
-
-		this[BUFFER] = Buffer.concat(buffers);
-
-		let type = options && options.type !== undefined && String(options.type).toLowerCase();
-		if (type && !/[^\u0020-\u007E]/.test(type)) {
-			this[TYPE] = type;
-		}
-	}
-	get size() {
-		return this[CLOSED] ? 0 : this[BUFFER].length;
-	}
-	get type() {
-		return this[TYPE];
-	}
-	get isClosed() {
-		return this[CLOSED];
-	}
-	slice() {
-		const size = this.size;
-
-		const start = arguments[0];
-		const end = arguments[1];
-		let relativeStart, relativeEnd;
-		if (start === undefined) {
-			relativeStart = 0;
-		} else if (start < 0) {
-			relativeStart = Math.max(size + start, 0);
-		} else {
-			relativeStart = Math.min(start, size);
-		}
-		if (end === undefined) {
-			relativeEnd = size;
-		} else if (end < 0) {
-			relativeEnd = Math.max(size + end, 0);
-		} else {
-			relativeEnd = Math.min(end, size);
-		}
-		const span = Math.max(relativeEnd - relativeStart, 0);
-
-		const buffer = this[BUFFER];
-		const slicedBuffer = buffer.slice(relativeStart, relativeStart + span);
-		const blob = new Blob([], { type: arguments[2] });
-		blob[BUFFER] = slicedBuffer;
-		blob[CLOSED] = this[CLOSED];
-		return blob;
-	}
-	close() {
-		this[CLOSED] = true;
-	}
-}
-
-Object.defineProperty(Blob.prototype, Symbol.toStringTag, {
-	value: 'BlobPrototype',
-	writable: false,
-	enumerable: false,
-	configurable: true
-});
-
-/**
- * fetch-error.js
- *
- * FetchError interface for operational errors
- */
-
-/**
- * Create FetchError instance
- *
- * @param   String      message      Error message for human
- * @param   String      type         Error type for machine
- * @param   String      systemError  For Node.js system error
- * @return  FetchError
- */
-function FetchError(message, type, systemError) {
-  Error.call(this, message);
-
-  this.message = message;
-  this.type = type;
-
-  // when err.type is `system`, err.code contains system error code
-  if (systemError) {
-    this.code = this.errno = systemError.code;
-  }
-
-  // hide custom error implementation details from end-users
-  Error.captureStackTrace(this, this.constructor);
-}
-
-FetchError.prototype = Object.create(Error.prototype);
-FetchError.prototype.constructor = FetchError;
-FetchError.prototype.name = 'FetchError';
-
-/**
- * body.js
- *
- * Body interface provides common methods for Request and Response
- */
-
-const Stream = require('stream');
-
-var _require$1 = require('stream');
-
-const PassThrough$1 = _require$1.PassThrough;
-
-
-const DISTURBED = Symbol('disturbed');
-
-let convert;
-try {
-	convert = require('encoding').convert;
-} catch (e) {}
-
-/**
- * Body class
- *
- * Cannot use ES6 class because Body must be called with .call().
- *
- * @param   Stream  body  Readable stream
- * @param   Object  opts  Response options
- * @return  Void
- */
-function Body(body) {
-	var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
-	    _ref$size = _ref.size;
-
-	let size = _ref$size === undefined ? 0 : _ref$size;
-	var _ref$timeout = _ref.timeout;
-	let timeout = _ref$timeout === undefined ? 0 : _ref$timeout;
-
-	if (body == null) {
-		// body is undefined or null
-		body = null;
-	} else if (typeof body === 'string') {
-		// body is string
-	} else if (isURLSearchParams(body)) {
-		// body is a URLSearchParams
-	} else if (body instanceof Blob) {
-		// body is blob
-	} else if (Buffer.isBuffer(body)) {
-		// body is buffer
-	} else if (body instanceof Stream) {
-		// body is stream
-	} else {
-		// none of the above
-		// coerce to string
-		body = String(body);
-	}
-	this.body = body;
-	this[DISTURBED] = false;
-	this.size = size;
-	this.timeout = timeout;
-}
-
-Body.prototype = {
-	get bodyUsed() {
-		return this[DISTURBED];
-	},
-
-	/**
-  * Decode response as ArrayBuffer
-  *
-  * @return  Promise
-  */
-	arrayBuffer() {
-		return consumeBody.call(this).then(function (buf) {
-			return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength);
-		});
-	},
-
-	/**
-  * Return raw response as Blob
-  *
-  * @return Promise
-  */
-	blob() {
-		let ct = this.headers && this.headers.get('content-type') || '';
-		return consumeBody.call(this).then(function (buf) {
-			return Object.assign(
-			// Prevent copying
-			new Blob([], {
-				type: ct.toLowerCase()
-			}), {
-				[BUFFER]: buf
-			});
-		});
-	},
-
-	/**
-  * Decode response as json
-  *
-  * @return  Promise
-  */
-	json() {
-		var _this = this;
-
-		return consumeBody.call(this).then(function (buffer) {
-			try {
-				return JSON.parse(buffer.toString());
-			} catch (err) {
-				return Body.Promise.reject(new FetchError(`invalid json response body at ${_this.url} reason: ${err.message}`, 'invalid-json'));
-			}
-		});
-	},
-
-	/**
-  * Decode response as text
-  *
-  * @return  Promise
-  */
-	text() {
-		return consumeBody.call(this).then(function (buffer) {
-			return buffer.toString();
-		});
-	},
-
-	/**
-  * Decode response as buffer (non-spec api)
-  *
-  * @return  Promise
-  */
-	buffer() {
-		return consumeBody.call(this);
-	},
-
-	/**
-  * Decode response as text, while automatically detecting the encoding and
-  * trying to decode to UTF-8 (non-spec api)
-  *
-  * @return  Promise
-  */
-	textConverted() {
-		var _this2 = this;
-
-		return consumeBody.call(this).then(function (buffer) {
-			return convertBody(buffer, _this2.headers);
-		});
-	}
-
-};
-
-Body.mixIn = function (proto) {
-	for (const name of Object.getOwnPropertyNames(Body.prototype)) {
-		// istanbul ignore else: future proof
-		if (!(name in proto)) {
-			const desc = Object.getOwnPropertyDescriptor(Body.prototype, name);
-			Object.defineProperty(proto, name, desc);
-		}
-	}
-};
-
-/**
- * Decode buffers into utf-8 string
- *
- * @return  Promise
- */
-function consumeBody(body) {
-	var _this3 = this;
-
-	if (this[DISTURBED]) {
-		return Body.Promise.reject(new Error(`body used already for: ${this.url}`));
-	}
-
-	this[DISTURBED] = true;
-
-	// body is null
-	if (this.body === null) {
-		return Body.Promise.resolve(Buffer.alloc(0));
-	}
-
-	// body is string
-	if (typeof this.body === 'string') {
-		return Body.Promise.resolve(Buffer.from(this.body));
-	}
-
-	// body is blob
-	if (this.body instanceof Blob) {
-		return Body.Promise.resolve(this.body[BUFFER]);
-	}
-
-	// body is buffer
-	if (Buffer.isBuffer(this.body)) {
-		return Body.Promise.resolve(this.body);
-	}
-
-	// istanbul ignore if: should never happen
-	if (!(this.body instanceof Stream)) {
-		return Body.Promise.resolve(Buffer.alloc(0));
-	}
-
-	// body is stream
-	// get ready to actually consume the body
-	let accum = [];
-	let accumBytes = 0;
-	let abort = false;
-
-	return new Body.Promise(function (resolve, reject) {
-		let resTimeout;
-
-		// allow timeout on slow response body
-		if (_this3.timeout) {
-			resTimeout = setTimeout(function () {
-				abort = true;
-				reject(new FetchError(`Response timeout while trying to fetch ${_this3.url} (over ${_this3.timeout}ms)`, 'body-timeout'));
-			}, _this3.timeout);
-		}
-
-		// handle stream error, such as incorrect content-encoding
-		_this3.body.on('error', function (err) {
-			reject(new FetchError(`Invalid response body while trying to fetch ${_this3.url}: ${err.message}`, 'system', err));
-		});
-
-		_this3.body.on('data', function (chunk) {
-			if (abort || chunk === null) {
-				return;
-			}
-
-			if (_this3.size && accumBytes + chunk.length > _this3.size) {
-				abort = true;
-				reject(new FetchError(`content size at ${_this3.url} over limit: ${_this3.size}`, 'max-size'));
-				return;
-			}
-
-			accumBytes += chunk.length;
-			accum.push(chunk);
-		});
-
-		_this3.body.on('end', function () {
-			if (abort) {
-				return;
-			}
-
-			clearTimeout(resTimeout);
-			resolve(Buffer.concat(accum));
-		});
-	});
-}
-
-/**
- * Detect buffer encoding and convert to target encoding
- * ref: http://www.w3.org/TR/2011/WD-html5-20110113/parsing.html#determining-the-character-encoding
- *
- * @param   Buffer  buffer    Incoming buffer
- * @param   String  encoding  Target encoding
- * @return  String
- */
-function convertBody(buffer, headers) {
-	if (typeof convert !== 'function') {
-		throw new Error('The package `encoding` must be installed to use the textConverted() function');
-	}
-
-	const ct = headers.get('content-type');
-	let charset = 'utf-8';
-	let res, str;
-
-	// header
-	if (ct) {
-		res = /charset=([^;]*)/i.exec(ct);
-	}
-
-	// no charset in content type, peek at response body for at most 1024 bytes
-	str = buffer.slice(0, 1024).toString();
-
-	// html5
-	if (!res && str) {
-		res = /<meta.+?charset=(['"])(.+?)\1/i.exec(str);
-	}
-
-	// html4
-	if (!res && str) {
-		res = /<meta[\s]+?http-equiv=(['"])content-type\1[\s]+?content=(['"])(.+?)\2/i.exec(str);
-
-		if (res) {
-			res = /charset=(.*)/i.exec(res.pop());
-		}
-	}
-
-	// xml
-	if (!res && str) {
-		res = /<\?xml.+?encoding=(['"])(.+?)\1/i.exec(str);
-	}
-
-	// found charset
-	if (res) {
-		charset = res.pop();
-
-		// prevent decode issues when sites use incorrect encoding
-		// ref: https://hsivonen.fi/encoding-menu/
-		if (charset === 'gb2312' || charset === 'gbk') {
-			charset = 'gb18030';
-		}
-	}
-
-	// turn raw buffers into a single utf-8 buffer
-	return convert(buffer, 'UTF-8', charset).toString();
-}
-
-/**
- * Detect a URLSearchParams object
- * ref: https://github.com/bitinn/node-fetch/issues/296#issuecomment-307598143
- *
- * @param   Object  obj     Object to detect by type or brand
- * @return  String
- */
-function isURLSearchParams(obj) {
-	// Duck-typing as a necessary condition.
-	if (typeof obj !== 'object' || typeof obj.append !== 'function' || typeof obj.delete !== 'function' || typeof obj.get !== 'function' || typeof obj.getAll !== 'function' || typeof obj.has !== 'function' || typeof obj.set !== 'function') {
-		return false;
-	}
-
-	// Brand-checking and more duck-typing as optional condition.
-	return obj.constructor.name === 'URLSearchParams' || Object.prototype.toString.call(obj) === '[object URLSearchParams]' || typeof obj.sort === 'function';
-}
-
-/**
- * Clone body given Res/Req instance
- *
- * @param   Mixed  instance  Response or Request instance
- * @return  Mixed
- */
-function clone(instance) {
-	let p1, p2;
-	let body = instance.body;
-
-	// don't allow cloning a used body
-	if (instance.bodyUsed) {
-		throw new Error('cannot clone body after it is used');
-	}
-
-	// check that body is a stream and not form-data object
-	// note: we can't clone the form-data object without having it as a dependency
-	if (body instanceof Stream && typeof body.getBoundary !== 'function') {
-		// tee instance body
-		p1 = new PassThrough$1();
-		p2 = new PassThrough$1();
-		body.pipe(p1);
-		body.pipe(p2);
-		// set instance body to teed body and return the other teed body
-		instance.body = p1;
-		body = p2;
-	}
-
-	return body;
-}
-
-/**
- * Performs the operation "extract a `Content-Type` value from |object|" as
- * specified in the specification:
- * https://fetch.spec.whatwg.org/#concept-bodyinit-extract
- *
- * This function assumes that instance.body is present and non-null.
- *
- * @param   Mixed  instance  Response or Request instance
- */
-function extractContentType(instance) {
-	const body = instance.body;
-
-	// istanbul ignore if: Currently, because of a guard in Request, body
-	// can never be null. Included here for completeness.
-
-	if (body === null) {
-		// body is null
-		return null;
-	} else if (typeof body === 'string') {
-		// body is string
-		return 'text/plain;charset=UTF-8';
-	} else if (isURLSearchParams(body)) {
-		// body is a URLSearchParams
-		return 'application/x-www-form-urlencoded;charset=UTF-8';
-	} else if (body instanceof Blob) {
-		// body is blob
-		return body.type || null;
-	} else if (Buffer.isBuffer(body)) {
-		// body is buffer
-		return null;
-	} else if (typeof body.getBoundary === 'function') {
-		// detect form data input from form-data module
-		return `multipart/form-data;boundary=${body.getBoundary()}`;
-	} else {
-		// body is stream
-		// can't really do much about this
-		return null;
-	}
-}
-
-function getTotalBytes(instance) {
-	const body = instance.body;
-
-	// istanbul ignore if: included for completion
-
-	if (body === null) {
-		// body is null
-		return 0;
-	} else if (typeof body === 'string') {
-		// body is string
-		return Buffer.byteLength(body);
-	} else if (isURLSearchParams(body)) {
-		// body is URLSearchParams
-		return Buffer.byteLength(String(body));
-	} else if (body instanceof Blob) {
-		// body is blob
-		return body.size;
-	} else if (Buffer.isBuffer(body)) {
-		// body is buffer
-		return body.length;
-	} else if (body && typeof body.getLengthSync === 'function') {
-		// detect form data input from form-data module
-		if (body._lengthRetrievers && body._lengthRetrievers.length == 0 || // 1.x
-		body.hasKnownLength && body.hasKnownLength()) {
-			// 2.x
-			return body.getLengthSync();
-		}
-		return null;
-	} else {
-		// body is stream
-		// can't really do much about this
-		return null;
-	}
-}
-
-function writeToStream(dest, instance) {
-	const body = instance.body;
-
-
-	if (body === null) {
-		// body is null
-		dest.end();
-	} else if (typeof body === 'string') {
-		// body is string
-		dest.write(body);
-		dest.end();
-	} else if (isURLSearchParams(body)) {
-		// body is URLSearchParams
-		dest.write(Buffer.from(String(body)));
-		dest.end();
-	} else if (body instanceof Blob) {
-		// body is blob
-		dest.write(body[BUFFER]);
-		dest.end();
-	} else if (Buffer.isBuffer(body)) {
-		// body is buffer
-		dest.write(body);
-		dest.end();
-	} else {
-		// body is stream
-		body.pipe(dest);
-	}
-}
-
-// expose Promise
-Body.Promise = global.Promise;
-
-/**
- * A set of utilities borrowed from Node.js' _http_common.js
- */
-
-/**
- * Verifies that the given val is a valid HTTP token
- * per the rules defined in RFC 7230
- * See https://tools.ietf.org/html/rfc7230#section-3.2.6
- *
- * Allowed characters in an HTTP token:
- * ^_`a-z  94-122
- * A-Z     65-90
- * -       45
- * 0-9     48-57
- * !       33
- * #$%&'   35-39
- * *+      42-43
- * .       46
- * |       124
- * ~       126
- *
- * This implementation of checkIsHttpToken() loops over the string instead of
- * using a regular expression since the former is up to 180% faster with v8 4.9
- * depending on the string length (the shorter the string, the larger the
- * performance difference)
- *
- * Additionally, checkIsHttpToken() is currently designed to be inlinable by v8,
- * so take care when making changes to the implementation so that the source
- * code size does not exceed v8's default max_inlined_source_size setting.
- **/
-/* istanbul ignore next */
-function isValidTokenChar(ch) {
-  if (ch >= 94 && ch <= 122) return true;
-  if (ch >= 65 && ch <= 90) return true;
-  if (ch === 45) return true;
-  if (ch >= 48 && ch <= 57) return true;
-  if (ch === 34 || ch === 40 || ch === 41 || ch === 44) return false;
-  if (ch >= 33 && ch <= 46) return true;
-  if (ch === 124 || ch === 126) return true;
-  return false;
-}
-/* istanbul ignore next */
-function checkIsHttpToken(val) {
-  if (typeof val !== 'string' || val.length === 0) return false;
-  if (!isValidTokenChar(val.charCodeAt(0))) return false;
-  const len = val.length;
-  if (len > 1) {
-    if (!isValidTokenChar(val.charCodeAt(1))) return false;
-    if (len > 2) {
-      if (!isValidTokenChar(val.charCodeAt(2))) return false;
-      if (len > 3) {
-        if (!isValidTokenChar(val.charCodeAt(3))) return false;
-        for (var i = 4; i < len; i++) {
-          if (!isValidTokenChar(val.charCodeAt(i))) return false;
-        }
-      }
-    }
-  }
-  return true;
-}
-/**
- * True if val contains an invalid field-vchar
- *  field-value    = *( field-content / obs-fold )
- *  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
- *  field-vchar    = VCHAR / obs-text
- *
- * checkInvalidHeaderChar() is currently designed to be inlinable by v8,
- * so take care when making changes to the implementation so that the source
- * code size does not exceed v8's default max_inlined_source_size setting.
- **/
-/* istanbul ignore next */
-function checkInvalidHeaderChar(val) {
-  val += '';
-  if (val.length < 1) return false;
-  var c = val.charCodeAt(0);
-  if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
-  if (val.length < 2) return false;
-  c = val.charCodeAt(1);
-  if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
-  if (val.length < 3) return false;
-  c = val.charCodeAt(2);
-  if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
-  for (var i = 3; i < val.length; ++i) {
-    c = val.charCodeAt(i);
-    if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
-  }
-  return false;
-}
-
-/**
- * headers.js
- *
- * Headers class offers convenient helpers
- */
-
-function sanitizeName(name) {
-	name += '';
-	if (!checkIsHttpToken(name)) {
-		throw new TypeError(`${name} is not a legal HTTP header name`);
-	}
-	return name.toLowerCase();
-}
-
-function sanitizeValue(value) {
-	value += '';
-	if (checkInvalidHeaderChar(value)) {
-		throw new TypeError(`${value} is not a legal HTTP header value`);
-	}
-	return value;
-}
-
-const MAP = Symbol('map');
-class Headers {
-	/**
-  * Headers class
-  *
-  * @param   Object  headers  Response headers
-  * @return  Void
-  */
-	constructor() {
-		let init = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
-
-		this[MAP] = Object.create(null);
-
-		if (init instanceof Headers) {
-			const rawHeaders = init.raw();
-			const headerNames = Object.keys(rawHeaders);
-
-			for (const headerName of headerNames) {
-				for (const value of rawHeaders[headerName]) {
-					this.append(headerName, value);
-				}
-			}
-
-			return;
-		}
-
-		// We don't worry about converting prop to ByteString here as append()
-		// will handle it.
-		if (init == null) {
-			// no op
-		} else if (typeof init === 'object') {
-			const method = init[Symbol.iterator];
-			if (method != null) {
-				if (typeof method !== 'function') {
-					throw new TypeError('Header pairs must be iterable');
-				}
-
-				// sequence<sequence<ByteString>>
-				// Note: per spec we have to first exhaust the lists then process them
-				const pairs = [];
-				for (const pair of init) {
-					if (typeof pair !== 'object' || typeof pair[Symbol.iterator] !== 'function') {
-						throw new TypeError('Each header pair must be iterable');
-					}
-					pairs.push(Array.from(pair));
-				}
-
-				for (const pair of pairs) {
-					if (pair.length !== 2) {
-						throw new TypeError('Each header pair must be a name/value tuple');
-					}
-					this.append(pair[0], pair[1]);
-				}
-			} else {
-				// record<ByteString, ByteString>
-				for (const key of Object.keys(init)) {
-					const value = init[key];
-					this.append(key, value);
-				}
-			}
-		} else {
-			throw new TypeError('Provided initializer must be an object');
-		}
-
-		Object.defineProperty(this, Symbol.toStringTag, {
-			value: 'Headers',
-			writable: false,
-			enumerable: false,
-			configurable: true
-		});
-	}
-
-	/**
-  * Return first header value given name
-  *
-  * @param   String  name  Header name
-  * @return  Mixed
-  */
-	get(name) {
-		const list = this[MAP][sanitizeName(name)];
-		if (!list) {
-			return null;
-		}
-
-		return list.join(', ');
-	}
-
-	/**
-  * Iterate over all headers
-  *
-  * @param   Function  callback  Executed for each item with parameters (value, name, thisArg)
-  * @param   Boolean   thisArg   `this` context for callback function
-  * @return  Void
-  */
-	forEach(callback) {
-		let thisArg = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : undefined;
-
-		let pairs = getHeaderPairs(this);
-		let i = 0;
-		while (i < pairs.length) {
-			var _pairs$i = pairs[i];
-			const name = _pairs$i[0],
-			      value = _pairs$i[1];
-
-			callback.call(thisArg, value, name, this);
-			pairs = getHeaderPairs(this);
-			i++;
-		}
-	}
-
-	/**
-  * Overwrite header values given name
-  *
-  * @param   String  name   Header name
-  * @param   String  value  Header value
-  * @return  Void
-  */
-	set(name, value) {
-		this[MAP][sanitizeName(name)] = [sanitizeValue(value)];
-	}
-
-	/**
-  * Append a value onto existing header
-  *
-  * @param   String  name   Header name
-  * @param   String  value  Header value
-  * @return  Void
-  */
-	append(name, value) {
-		if (!this.has(name)) {
-			this.set(name, value);
-			return;
-		}
-
-		this[MAP][sanitizeName(name)].push(sanitizeValue(value));
-	}
-
-	/**
-  * Check for header name existence
-  *
-  * @param   String   name  Header name
-  * @return  Boolean
-  */
-	has(name) {
-		return !!this[MAP][sanitizeName(name)];
-	}
-
-	/**
-  * Delete all header values given name
-  *
-  * @param   String  name  Header name
-  * @return  Void
-  */
-	delete(name) {
-		delete this[MAP][sanitizeName(name)];
-	}
-
-	/**
-  * Return raw headers (non-spec api)
-  *
-  * @return  Object
-  */
-	raw() {
-		return this[MAP];
-	}
-
-	/**
-  * Get an iterator on keys.
-  *
-  * @return  Iterator
-  */
-	keys() {
-		return createHeadersIterator(this, 'key');
-	}
-
-	/**
-  * Get an iterator on values.
-  *
-  * @return  Iterator
-  */
-	values() {
-		return createHeadersIterator(this, 'value');
-	}
-
-	/**
-  * Get an iterator on entries.
-  *
-  * This is the default iterator of the Headers object.
-  *
-  * @return  Iterator
-  */
-	[Symbol.iterator]() {
-		return createHeadersIterator(this, 'key+value');
-	}
-}
-Headers.prototype.entries = Headers.prototype[Symbol.iterator];
-
-Object.defineProperty(Headers.prototype, Symbol.toStringTag, {
-	value: 'HeadersPrototype',
-	writable: false,
-	enumerable: false,
-	configurable: true
-});
-
-function getHeaderPairs(headers, kind) {
-	const keys = Object.keys(headers[MAP]).sort();
-	return keys.map(kind === 'key' ? function (k) {
-		return [k];
-	} : function (k) {
-		return [k, headers.get(k)];
-	});
-}
-
-const INTERNAL = Symbol('internal');
-
-function createHeadersIterator(target, kind) {
-	const iterator = Object.create(HeadersIteratorPrototype);
-	iterator[INTERNAL] = {
-		target,
-		kind,
-		index: 0
-	};
-	return iterator;
-}
-
-const HeadersIteratorPrototype = Object.setPrototypeOf({
-	next() {
-		// istanbul ignore if
-		if (!this || Object.getPrototypeOf(this) !== HeadersIteratorPrototype) {
-			throw new TypeError('Value of `this` is not a HeadersIterator');
-		}
-
-		var _INTERNAL = this[INTERNAL];
-		const target = _INTERNAL.target,
-		      kind = _INTERNAL.kind,
-		      index = _INTERNAL.index;
-
-		const values = getHeaderPairs(target, kind);
-		const len = values.length;
-		if (index >= len) {
-			return {
-				value: undefined,
-				done: true
-			};
-		}
-
-		const pair = values[index];
-		this[INTERNAL].index = index + 1;
-
-		let result;
-		if (kind === 'key') {
-			result = pair[0];
-		} else if (kind === 'value') {
-			result = pair[1];
-		} else {
-			result = pair;
-		}
-
-		return {
-			value: result,
-			done: false
-		};
-	}
-}, Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]())));
-
-Object.defineProperty(HeadersIteratorPrototype, Symbol.toStringTag, {
-	value: 'HeadersIterator',
-	writable: false,
-	enumerable: false,
-	configurable: true
-});
-
-/**
- * response.js
- *
- * Response class provides content decoding
- */
-
-var _require$2 = require('http');
-
-const STATUS_CODES = _require$2.STATUS_CODES;
-
-/**
- * Response class
- *
- * @param   Stream  body  Readable stream
- * @param   Object  opts  Response options
- * @return  Void
- */
-
-class Response {
-	constructor() {
-		let body = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
-		let opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
-
-		Body.call(this, body, opts);
-
-		this.url = opts.url;
-		this.status = opts.status || 200;
-		this.statusText = opts.statusText || STATUS_CODES[this.status];
-
-		this.headers = new Headers(opts.headers);
-
-		Object.defineProperty(this, Symbol.toStringTag, {
-			value: 'Response',
-			writable: false,
-			enumerable: false,
-			configurable: true
-		});
-	}
-
-	/**
-  * Convenience property representing if the request ended normally
-  */
-	get ok() {
-		return this.status >= 200 && this.status < 300;
-	}
-
-	/**
-  * Clone this response
-  *
-  * @return  Response
-  */
-	clone() {
-
-		return new Response(clone(this), {
-			url: this.url,
-			status: this.status,
-			statusText: this.statusText,
-			headers: this.headers,
-			ok: this.ok
-		});
-	}
-}
-
-Body.mixIn(Response.prototype);
-
-Object.defineProperty(Response.prototype, Symbol.toStringTag, {
-	value: 'ResponsePrototype',
-	writable: false,
-	enumerable: false,
-	configurable: true
-});
-
-/**
- * request.js
- *
- * Request class contains server only options
- */
-
-var _require$3 = require('url');
-
-const format_url = _require$3.format;
-const parse_url = _require$3.parse;
-
-
-const PARSED_URL = Symbol('url');
-
-/**
- * Request class
- *
- * @param   Mixed   input  Url or Request instance
- * @param   Object  init   Custom options
- * @return  Void
- */
-class Request {
-	constructor(input) {
-		let init = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
-
-		let parsedURL;
-
-		// normalize input
-		if (!(input instanceof Request)) {
-			if (input && input.href) {
-				// in order to support Node.js' Url objects; though WHATWG's URL objects
-				// will fall into this branch also (since their `toString()` will return
-				// `href` property anyway)
-				parsedURL = parse_url(input.href);
-			} else {
-				// coerce input to a string before attempting to parse
-				parsedURL = parse_url(`${input}`);
-			}
-			input = {};
-		} else {
-			parsedURL = parse_url(input.url);
-		}
-
-		let method = init.method || input.method || 'GET';
-
-		if ((init.body != null || input instanceof Request && input.body !== null) && (method === 'GET' || method === 'HEAD')) {
-			throw new TypeError('Request with GET/HEAD method cannot have body');
-		}
-
-		let inputBody = init.body != null ? init.body : input instanceof Request && input.body !== null ? clone(input) : null;
-
-		Body.call(this, inputBody, {
-			timeout: init.timeout || input.timeout || 0,
-			size: init.size || input.size || 0
-		});
-
-		// fetch spec options
-		this.method = method.toUpperCase();
-		this.redirect = init.redirect || input.redirect || 'follow';
-		this.headers = new Headers(init.headers || input.headers || {});
-
-		if (init.body != null) {
-			const contentType = extractContentType(this);
-			if (contentType !== null && !this.headers.has('Content-Type')) {
-				this.headers.append('Content-Type', contentType);
-			}
-		}
-
-		// server only options
-		this.follow = init.follow !== undefined ? init.follow : input.follow !== undefined ? input.follow : 20;
-		this.compress = init.compress !== undefined ? init.compress : input.compress !== undefined ? input.compress : true;
-		this.counter = init.counter || input.counter || 0;
-		this.agent = init.agent || input.agent;
-
-		this[PARSED_URL] = parsedURL;
-		Object.defineProperty(this, Symbol.toStringTag, {
-			value: 'Request',
-			writable: false,
-			enumerable: false,
-			configurable: true
-		});
-	}
-
-	get url() {
-		return format_url(this[PARSED_URL]);
-	}
-
-	/**
-  * Clone this request
-  *
-  * @return  Request
-  */
-	clone() {
-		return new Request(this);
-	}
-}
-
-Body.mixIn(Request.prototype);
-
-Object.defineProperty(Request.prototype, Symbol.toStringTag, {
-	value: 'RequestPrototype',
-	writable: false,
-	enumerable: false,
-	configurable: true
-});
-
-function getNodeRequestOptions(request) {
-	const parsedURL = request[PARSED_URL];
-	const headers = new Headers(request.headers);
-
-	// fetch step 3
-	if (!headers.has('Accept')) {
-		headers.set('Accept', '*/*');
-	}
-
-	// Basic fetch
-	if (!parsedURL.protocol || !parsedURL.hostname) {
-		throw new TypeError('Only absolute URLs are supported');
-	}
-
-	if (!/^https?:$/.test(parsedURL.protocol)) {
-		throw new TypeError('Only HTTP(S) protocols are supported');
-	}
-
-	// HTTP-network-or-cache fetch steps 5-9
-	let contentLengthValue = null;
-	if (request.body == null && /^(POST|PUT)$/i.test(request.method)) {
-		contentLengthValue = '0';
-	}
-	if (request.body != null) {
-		const totalBytes = getTotalBytes(request);
-		if (typeof totalBytes === 'number') {
-			contentLengthValue = String(totalBytes);
-		}
-	}
-	if (contentLengthValue) {
-		headers.set('Content-Length', contentLengthValue);
-	}
-
-	// HTTP-network-or-cache fetch step 12
-	if (!headers.has('User-Agent')) {
-		headers.set('User-Agent', 'node-fetch/1.0 (+https://github.com/bitinn/node-fetch)');
-	}
-
-	// HTTP-network-or-cache fetch step 16
-	if (request.compress) {
-		headers.set('Accept-Encoding', 'gzip,deflate');
-	}
-	if (!headers.has('Connection') && !request.agent) {
-		headers.set('Connection', 'close');
-	}
-
-	// HTTP-network fetch step 4
-	// chunked encoding is handled by Node.js
-
-	return Object.assign({}, parsedURL, {
-		method: request.method,
-		headers: headers.raw(),
-		agent: request.agent
-	});
-}
-
-/**
- * index.js
- *
- * a request API compatible with window.fetch
- */
-
-const http = require('http');
-const https = require('https');
-
-var _require = require('stream');
-
-const PassThrough = _require.PassThrough;
-
-var _require2 = require('url');
-
-const resolve_url = _require2.resolve;
-
-const zlib = require('zlib');
-
-/**
- * Fetch function
- *
- * @param   Mixed    url   Absolute url or Request instance
- * @param   Object   opts  Fetch options
- * @return  Promise
- */
-function fetch(url, opts) {
-
-	// allow custom promise
-	if (!fetch.Promise) {
-		throw new Error('native promise missing, set fetch.Promise to your favorite alternative');
-	}
-
-	Body.Promise = fetch.Promise;
-
-	// wrap http.request into fetch
-	return new fetch.Promise(function (resolve, reject) {
-		// build request object
-		const request = new Request(url, opts);
-		const options = getNodeRequestOptions(request);
-
-		const send = (options.protocol === 'https:' ? https : http).request;
-
-		// http.request only support string as host header, this hack make custom host header possible
-		if (options.headers.host) {
-			options.headers.host = options.headers.host[0];
-		}
-
-		// send request
-		const req = send(options);
-		let reqTimeout;
-
-		if (request.timeout) {
-			req.once('socket', function (socket) {
-				reqTimeout = setTimeout(function () {
-					req.abort();
-					reject(new FetchError(`network timeout at: ${request.url}`, 'request-timeout'));
-				}, request.timeout);
-			});
-		}
-
-		req.on('error', function (err) {
-			clearTimeout(reqTimeout);
-			reject(new FetchError(`request to ${request.url} failed, reason: ${err.message}`, 'system', err));
-		});
-
-		req.on('response', function (res) {
-			clearTimeout(reqTimeout);
-
-			// handle redirect
-			if (fetch.isRedirect(res.statusCode) && request.redirect !== 'manual') {
-				if (request.redirect === 'error') {
-					reject(new FetchError(`redirect mode is set to error: ${request.url}`, 'no-redirect'));
-					return;
-				}
-
-				if (request.counter >= request.follow) {
-					reject(new FetchError(`maximum redirect reached at: ${request.url}`, 'max-redirect'));
-					return;
-				}
-
-				if (!res.headers.location) {
-					reject(new FetchError(`redirect location header missing at: ${request.url}`, 'invalid-redirect'));
-					return;
-				}
-
-				// per fetch spec, for POST request with 301/302 response, or any request with 303 response, use GET when following redirect
-				if (res.statusCode === 303 || (res.statusCode === 301 || res.statusCode === 302) && request.method === 'POST') {
-					request.method = 'GET';
-					request.body = null;
-					request.headers.delete('content-length');
-				}
-
-				request.counter++;
-
-				resolve(fetch(resolve_url(request.url, res.headers.location), request));
-				return;
-			}
-
-			// normalize location header for manual redirect mode
-			const headers = new Headers();
-			for (const name of Object.keys(res.headers)) {
-				if (Array.isArray(res.headers[name])) {
-					for (const val of res.headers[name]) {
-						headers.append(name, val);
-					}
-				} else {
-					headers.append(name, res.headers[name]);
-				}
-			}
-			if (request.redirect === 'manual' && headers.has('location')) {
-				headers.set('location', resolve_url(request.url, headers.get('location')));
-			}
-
-			// prepare response
-			let body = res.pipe(new PassThrough());
-			const response_options = {
-				url: request.url,
-				status: res.statusCode,
-				statusText: res.statusMessage,
-				headers: headers,
-				size: request.size,
-				timeout: request.timeout
-			};
-
-			// HTTP-network fetch step 16.1.2
-			const codings = headers.get('Content-Encoding');
-
-			// HTTP-network fetch step 16.1.3: handle content codings
-
-			// in following scenarios we ignore compression support
-			// 1. compression support is disabled
-			// 2. HEAD request
-			// 3. no Content-Encoding header
-			// 4. no content response (204)
-			// 5. content not modified response (304)
-			if (!request.compress || request.method === 'HEAD' || codings === null || res.statusCode === 204 || res.statusCode === 304) {
-				resolve(new Response(body, response_options));
-				return;
-			}
-
-			// For Node v6+
-			// Be less strict when decoding compressed responses, since sometimes
-			// servers send slightly invalid responses that are still accepted
-			// by common browsers.
-			// Always using Z_SYNC_FLUSH is what cURL does.
-			const zlibOptions = {
-				flush: zlib.Z_SYNC_FLUSH,
-				finishFlush: zlib.Z_SYNC_FLUSH
-			};
-
-			// for gzip
-			if (codings == 'gzip' || codings == 'x-gzip') {
-				body = body.pipe(zlib.createGunzip(zlibOptions));
-				resolve(new Response(body, response_options));
-				return;
-			}
-
-			// for deflate
-			if (codings == 'deflate' || codings == 'x-deflate') {
-				// handle the infamous raw deflate response from old servers
-				// a hack for old IIS and Apache servers
-				const raw = res.pipe(new PassThrough());
-				raw.once('data', function (chunk) {
-					// see http://stackoverflow.com/questions/37519828
-					if ((chunk[0] & 0x0F) === 0x08) {
-						body = body.pipe(zlib.createInflate());
-					} else {
-						body = body.pipe(zlib.createInflateRaw());
-					}
-					resolve(new Response(body, response_options));
-				});
-				return;
-			}
-
-			// otherwise, use response as-is
-			resolve(new Response(body, response_options));
-		});
-
-		writeToStream(req, request);
-	});
-}
-
-/**
- * Redirect code matching
- *
- * @param   Number   code  Status code
- * @return  Boolean
- */
-fetch.isRedirect = function (code) {
-	return code === 301 || code === 302 || code === 303 || code === 307 || code === 308;
-};
-
-// expose Promise
-fetch.Promise = global.Promise;
-
-module.exports = exports = fetch;
-exports.Headers = Headers;
-exports.Request = Request;
-exports.Response = Response;
-exports.FetchError = FetchError;
diff --git a/hash_script/node_modules/node-fetch/lib/request.js b/hash_script/node_modules/node-fetch/lib/request.js
deleted file mode 100644
index 1a29c29..0000000
--- a/hash_script/node_modules/node-fetch/lib/request.js
+++ /dev/null
@@ -1,75 +0,0 @@
-
-/**
- * request.js
- *
- * Request class contains server only options
- */
-
-var parse_url = require('url').parse;
-var Headers = require('./headers');
-var Body = require('./body');
-
-module.exports = Request;
-
-/**
- * Request class
- *
- * @param   Mixed   input  Url or Request instance
- * @param   Object  init   Custom options
- * @return  Void
- */
-function Request(input, init) {
-	var url, url_parsed;
-
-	// normalize input
-	if (!(input instanceof Request)) {
-		url = input;
-		url_parsed = parse_url(url);
-		input = {};
-	} else {
-		url = input.url;
-		url_parsed = parse_url(url);
-	}
-
-	// normalize init
-	init = init || {};
-
-	// fetch spec options
-	this.method = init.method || input.method || 'GET';
-	this.redirect = init.redirect || input.redirect || 'follow';
-	this.headers = new Headers(init.headers || input.headers || {});
-	this.url = url;
-
-	// server only options
-	this.follow = init.follow !== undefined ?
-		init.follow : input.follow !== undefined ?
-		input.follow : 20;
-	this.compress = init.compress !== undefined ?
-		init.compress : input.compress !== undefined ?
-		input.compress : true;
-	this.counter = init.counter || input.counter || 0;
-	this.agent = init.agent || input.agent;
-
-	Body.call(this, init.body || this._clone(input), {
-		timeout: init.timeout || input.timeout || 0,
-		size: init.size || input.size || 0
-	});
-
-	// server request options
-	this.protocol = url_parsed.protocol;
-	this.hostname = url_parsed.hostname;
-	this.port = url_parsed.port;
-	this.path = url_parsed.path;
-	this.auth = url_parsed.auth;
-}
-
-Request.prototype = Object.create(Body.prototype);
-
-/**
- * Clone this request
- *
- * @return  Request
- */
-Request.prototype.clone = function() {
-	return new Request(this);
-};
diff --git a/hash_script/node_modules/node-fetch/lib/response.js b/hash_script/node_modules/node-fetch/lib/response.js
deleted file mode 100644
index f96aa85..0000000
--- a/hash_script/node_modules/node-fetch/lib/response.js
+++ /dev/null
@@ -1,50 +0,0 @@
-
-/**
- * response.js
- *
- * Response class provides content decoding
- */
-
-var http = require('http');
-var Headers = require('./headers');
-var Body = require('./body');
-
-module.exports = Response;
-
-/**
- * Response class
- *
- * @param   Stream  body  Readable stream
- * @param   Object  opts  Response options
- * @return  Void
- */
-function Response(body, opts) {
-
-	opts = opts || {};
-
-	this.url = opts.url;
-	this.status = opts.status || 200;
-	this.statusText = opts.statusText || http.STATUS_CODES[this.status];
-	this.headers = new Headers(opts.headers);
-	this.ok = this.status >= 200 && this.status < 300;
-
-	Body.call(this, body, opts);
-
-}
-
-Response.prototype = Object.create(Body.prototype);
-
-/**
- * Clone this response
- *
- * @return  Response
- */
-Response.prototype.clone = function() {
-	return new Response(this._clone(this), {
-		url: this.url
-		, status: this.status
-		, statusText: this.statusText
-		, headers: this.headers
-		, ok: this.ok
-	});
-};
diff --git a/hash_script/node_modules/node-fetch/package.json b/hash_script/node_modules/node-fetch/package.json
deleted file mode 100644
index dcb8f7b..0000000
--- a/hash_script/node_modules/node-fetch/package.json
+++ /dev/null
@@ -1,110 +0,0 @@
-{
-  "_args": [
-    [
-      {
-        "raw": "node-fetch@^1.7.2",
-        "scope": null,
-        "escapedName": "node-fetch",
-        "name": "node-fetch",
-        "rawSpec": "^1.7.2",
-        "spec": ">=1.7.2 <2.0.0",
-        "type": "range"
-      },
-      "/home/nate/Desktop/tar_JDkx6AzcE"
-    ]
-  ],
-  "_from": "node-fetch@>=1.7.2 <2.0.0",
-  "_id": "node-fetch@1.7.2",
-  "_inCache": true,
-  "_location": "/node-fetch",
-  "_nodeVersion": "8.2.1",
-  "_npmOperationalInternal": {
-    "host": "s3://npm-registry-packages",
-    "tmp": "tmp/node-fetch-1.7.2.tgz_1502191381219_0.664517188211903"
-  },
-  "_npmUser": {
-    "name": "bitinn",
-    "email": "bitinn@gmail.com"
-  },
-  "_npmVersion": "5.3.0",
-  "_phantomChildren": {},
-  "_requested": {
-    "raw": "node-fetch@^1.7.2",
-    "scope": null,
-    "escapedName": "node-fetch",
-    "name": "node-fetch",
-    "rawSpec": "^1.7.2",
-    "spec": ">=1.7.2 <2.0.0",
-    "type": "range"
-  },
-  "_requiredBy": [
-    "#USER",
-    "/"
-  ],
-  "_resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.2.tgz",
-  "_shasum": "c54e9aac57e432875233525f3c891c4159ffefd7",
-  "_shrinkwrap": null,
-  "_spec": "node-fetch@^1.7.2",
-  "_where": "/home/nate/Desktop/tar_JDkx6AzcE",
-  "author": {
-    "name": "David Frank"
-  },
-  "bugs": {
-    "url": "https://github.com/bitinn/node-fetch/issues"
-  },
-  "dependencies": {
-    "encoding": "^0.1.11",
-    "is-stream": "^1.0.1"
-  },
-  "description": "A light-weight module that brings window.fetch to node.js and io.js",
-  "devDependencies": {
-    "bluebird": "^3.3.4",
-    "chai": "^3.5.0",
-    "chai-as-promised": "^5.2.0",
-    "codecov": "^1.0.1",
-    "form-data": ">=1.0.0",
-    "istanbul": "^0.4.2",
-    "mocha": "^2.1.0",
-    "parted": "^0.1.1",
-    "promise": "^7.1.1",
-    "resumer": "0.0.0"
-  },
-  "directories": {},
-  "dist": {
-    "integrity": "sha512-xZZUq2yDhKMIn/UgG5q//IZSNLJIwW2QxS14CNH5spuiXkITM2pUitjdq58yLSaU7m4M0wBNaM2Gh/ggY4YJig==",
-    "shasum": "c54e9aac57e432875233525f3c891c4159ffefd7",
-    "tarball": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.2.tgz"
-  },
-  "gitHead": "3c9b64caf5c84f96052078f18d91c9e12bd5f5c6",
-  "homepage": "https://github.com/bitinn/node-fetch",
-  "keywords": [
-    "fetch",
-    "http",
-    "promise"
-  ],
-  "license": "MIT",
-  "main": "index.js",
-  "maintainers": [
-    {
-      "name": "bitinn",
-      "email": "bitinn@gmail.com"
-    },
-    {
-      "name": "timothygu",
-      "email": "timothygu99@gmail.com"
-    }
-  ],
-  "name": "node-fetch",
-  "optionalDependencies": {},
-  "readme": "ERROR: No README data found!",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/bitinn/node-fetch.git"
-  },
-  "scripts": {
-    "coverage": "istanbul cover _mocha --report lcovonly -- -R spec test/test.js && codecov",
-    "report": "istanbul cover _mocha -- -R spec test/test.js",
-    "test": "mocha test/test.js"
-  },
-  "version": "1.7.2"
-}
diff --git a/hash_script/node_modules/node-fetch/test/dummy.txt b/hash_script/node_modules/node-fetch/test/dummy.txt
deleted file mode 100644
index 5ca5191..0000000
--- a/hash_script/node_modules/node-fetch/test/dummy.txt
+++ /dev/null
@@ -1 +0,0 @@
-i am a dummy
\ No newline at end of file
diff --git a/hash_script/node_modules/node-fetch/test/server.js b/hash_script/node_modules/node-fetch/test/server.js
deleted file mode 100644
index 5b1b3b9..0000000
--- a/hash_script/node_modules/node-fetch/test/server.js
+++ /dev/null
@@ -1,340 +0,0 @@
-
-var http = require('http');
-var parse = require('url').parse;
-var zlib = require('zlib');
-var stream = require('stream');
-var convert = require('encoding').convert;
-var Multipart = require('parted').multipart;
-
-module.exports = TestServer;
-
-function TestServer() {
-	this.server = http.createServer(this.router);
-	this.port = 30001;
-	this.hostname = 'localhost';
-	// node 8 default keepalive timeout is 5000ms
-	// make it shorter here as we want to close server quickly at the end of tests
-	this.server.keepAliveTimeout = 1000;
-	this.server.on('error', function(err) {
-		console.log(err.stack);
-	});
-	this.server.on('connection', function(socket) {
-		socket.setTimeout(1500);
-	});
-}
-
-TestServer.prototype.start = function(cb) {
-	this.server.listen(this.port, this.hostname, cb);
-}
-
-TestServer.prototype.stop = function(cb) {
-	this.server.close(cb);
-}
-
-TestServer.prototype.router = function(req, res) {
-
-	var p = parse(req.url).pathname;
-
-	if (p === '/hello') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.end('world');
-	}
-
-	if (p === '/plain') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.end('text');
-	}
-
-	if (p === '/options') {
-		res.statusCode = 200;
-		res.setHeader('Allow', 'GET, HEAD, OPTIONS');
-		res.end('hello world');
-	}
-
-	if (p === '/html') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/html');
-		res.end('<html></html>');
-	}
-
-	if (p === '/json') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'application/json');
-		res.end(JSON.stringify({
-			name: 'value'
-		}));
-	}
-
-	if (p === '/gzip') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.setHeader('Content-Encoding', 'gzip');
-		zlib.gzip('hello world', function(err, buffer) {
-			res.end(buffer);
-		});
-	}
-
-	if (p === '/deflate') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.setHeader('Content-Encoding', 'deflate');
-		zlib.deflate('hello world', function(err, buffer) {
-			res.end(buffer);
-		});
-	}
-
-	if (p === '/deflate-raw') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.setHeader('Content-Encoding', 'deflate');
-		zlib.deflateRaw('hello world', function(err, buffer) {
-			res.end(buffer);
-		});
-	}
-
-	if (p === '/sdch') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.setHeader('Content-Encoding', 'sdch');
-		res.end('fake sdch string');
-	}
-
-	if (p === '/invalid-content-encoding') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.setHeader('Content-Encoding', 'gzip');
-		res.end('fake gzip string');
-	}
-
-	if (p === '/timeout') {
-		setTimeout(function() {
-			res.statusCode = 200;
-			res.setHeader('Content-Type', 'text/plain');
-			res.end('text');
-		}, 1000);
-	}
-
-	if (p === '/slow') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.write('test');
-		setTimeout(function() {
-			res.end('test');
-		}, 1000);
-	}
-
-	if (p === '/cookie') {
-		res.statusCode = 200;
-		res.setHeader('Set-Cookie', ['a=1', 'b=1']);
-		res.end('cookie');
-	}
-
-	if (p === '/size/chunk') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		setTimeout(function() {
-			res.write('test');
-		}, 50);
-		setTimeout(function() {
-			res.end('test');
-		}, 100);
-	}
-
-	if (p === '/size/long') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain');
-		res.end('testtest');
-	}
-
-	if (p === '/encoding/gbk') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/html');
-		res.end(convert('<meta charset="gbk"><div>中文</div>', 'gbk'));
-	}
-
-	if (p === '/encoding/gb2312') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/html');
-		res.end(convert('<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><div>中文</div>', 'gb2312'));
-	}
-
-	if (p === '/encoding/shift-jis') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/html; charset=Shift-JIS');
-		res.end(convert('<div>日本語</div>', 'Shift_JIS'));
-	}
-
-	if (p === '/encoding/euc-jp') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/xml');
-		res.end(convert('<?xml version="1.0" encoding="EUC-JP"?><title>日本語</title>', 'EUC-JP'));
-	}
-
-	if (p === '/encoding/utf8') {
-		res.statusCode = 200;
-		res.end('中文');
-	}
-
-	if (p === '/encoding/order1') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'charset=gbk; text/plain');
-		res.end(convert('中文', 'gbk'));
-	}
-
-	if (p === '/encoding/order2') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/plain; charset=gbk; qs=1');
-		res.end(convert('中文', 'gbk'));
-	}
-
-	if (p === '/encoding/chunked') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/html');
-		res.setHeader('Transfer-Encoding', 'chunked');
-		var padding = 'a';
-		for (var i = 0; i < 10; i++) {
-			res.write(padding);
-		}
-		res.end(convert('<meta http-equiv="Content-Type" content="text/html; charset=Shift_JIS" /><div>日本語</div>', 'Shift_JIS'));
-	}
-
-	if (p === '/encoding/invalid') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'text/html');
-		res.setHeader('Transfer-Encoding', 'chunked');
-		// because node v0.12 doesn't have str.repeat
-		var padding = new Array(120 + 1).join('a');
-		for (var i = 0; i < 10; i++) {
-			res.write(padding);
-		}
-		res.end(convert('中文', 'gbk'));
-	}
-
-	if (p === '/redirect/301') {
-		res.statusCode = 301;
-		res.setHeader('Location', '/inspect');
-		res.end();
-	}
-
-	if (p === '/redirect/302') {
-		res.statusCode = 302;
-		res.setHeader('Location', '/inspect');
-		res.end();
-	}
-
-	if (p === '/redirect/303') {
-		res.statusCode = 303;
-		res.setHeader('Location', '/inspect');
-		res.end();
-	}
-
-	if (p === '/redirect/307') {
-		res.statusCode = 307;
-		res.setHeader('Location', '/inspect');
-		res.end();
-	}
-
-	if (p === '/redirect/308') {
-		res.statusCode = 308;
-		res.setHeader('Location', '/inspect');
-		res.end();
-	}
-
-	if (p === '/redirect/chain') {
-		res.statusCode = 301;
-		res.setHeader('Location', '/redirect/301');
-		res.end();
-	}
-
-	if (p === '/error/redirect') {
-		res.statusCode = 301;
-		//res.setHeader('Location', '/inspect');
-		res.end();
-	}
-
-	if (p === '/error/400') {
-		res.statusCode = 400;
-		res.setHeader('Content-Type', 'text/plain');
-		res.end('client error');
-	}
-
-	if (p === '/error/404') {
-		res.statusCode = 404;
-		res.setHeader('Content-Encoding', 'gzip');
-		res.end();
-	}
-
-	if (p === '/error/500') {
-		res.statusCode = 500;
-		res.setHeader('Content-Type', 'text/plain');
-		res.end('server error');
-	}
-
-	if (p === '/error/reset') {
-		res.destroy();
-	}
-
-	if (p === '/error/json') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'application/json');
-		res.end('invalid json');
-	}
-
-	if (p === '/no-content') {
-		res.statusCode = 204;
-		res.end();
-	}
-
-	if (p === '/no-content/gzip') {
-		res.statusCode = 204;
-		res.setHeader('Content-Encoding', 'gzip');
-		res.end();
-	}
-
-	if (p === '/not-modified') {
-		res.statusCode = 304;
-		res.end();
-	}
-
-	if (p === '/not-modified/gzip') {
-		res.statusCode = 304;
-		res.setHeader('Content-Encoding', 'gzip');
-		res.end();
-	}
-
-	if (p === '/inspect') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'application/json');
-		var body = '';
-		req.on('data', function(c) { body += c });
-		req.on('end', function() {
-			res.end(JSON.stringify({
-				method: req.method,
-				url: req.url,
-				headers: req.headers,
-				body: body
-			}));
-		});
-	}
-
-	if (p === '/multipart') {
-		res.statusCode = 200;
-		res.setHeader('Content-Type', 'application/json');
-		var parser = new Multipart(req.headers['content-type']);
-		var body = '';
-		parser.on('part', function(field, part) {
-			body += field + '=' + part;
-		});
-		parser.on('end', function() {
-			res.end(JSON.stringify({
-				method: req.method,
-				url: req.url,
-				headers: req.headers,
-				body: body
-			}));
-		});
-		req.pipe(parser);
-	}
-}
diff --git a/hash_script/node_modules/node-fetch/test/test.js b/hash_script/node_modules/node-fetch/test/test.js
deleted file mode 100644
index 284b263..0000000
--- a/hash_script/node_modules/node-fetch/test/test.js
+++ /dev/null
@@ -1,1487 +0,0 @@
-
-// test tools
-var chai = require('chai');
-var cap = require('chai-as-promised');
-chai.use(cap);
-var expect = chai.expect;
-var bluebird = require('bluebird');
-var then = require('promise');
-var spawn = require('child_process').spawn;
-var stream = require('stream');
-var resumer = require('resumer');
-var FormData = require('form-data');
-var http = require('http');
-var fs = require('fs');
-
-var TestServer = require('./server');
-
-// test subjects
-var fetch = require('../index.js');
-var Headers = require('../lib/headers.js');
-var Response = require('../lib/response.js');
-var Request = require('../lib/request.js');
-var Body = require('../lib/body.js');
-var FetchError = require('../lib/fetch-error.js');
-// test with native promise on node 0.11, and bluebird for node 0.10
-fetch.Promise = fetch.Promise || bluebird;
-
-var url, opts, local, base;
-
-describe('node-fetch', function() {
-
-	before(function(done) {
-		local = new TestServer();
-		base = 'http://' + local.hostname + ':' + local.port;
-		local.start(done);
-	});
-
-	after(function(done) {
-		local.stop(done);
-	});
-
-	it('should return a promise', function() {
-		url = 'http://example.com/';
-		var p = fetch(url);
-		expect(p).to.be.an.instanceof(fetch.Promise);
-		expect(p).to.have.property('then');
-	});
-
-	it('should allow custom promise', function() {
-		url = 'http://example.com/';
-		var old = fetch.Promise;
-		fetch.Promise = then;
-		expect(fetch(url)).to.be.an.instanceof(then);
-		expect(fetch(url)).to.not.be.an.instanceof(bluebird);
-		fetch.Promise = old;
-	});
-
-	it('should throw error when no promise implementation are found', function() {
-		url = 'http://example.com/';
-		var old = fetch.Promise;
-		fetch.Promise = undefined;
-		expect(function() {
-			fetch(url)
-		}).to.throw(Error);
-		fetch.Promise = old;
-	});
-
-	it('should expose Headers, Response and Request constructors', function() {
-		expect(fetch.Headers).to.equal(Headers);
-		expect(fetch.Response).to.equal(Response);
-		expect(fetch.Request).to.equal(Request);
-	});
-
-	it('should reject with error if url is protocol relative', function() {
-		url = '//example.com/';
-		return expect(fetch(url)).to.eventually.be.rejectedWith(Error);
-	});
-
-	it('should reject with error if url is relative path', function() {
-		url = '/some/path';
-		return expect(fetch(url)).to.eventually.be.rejectedWith(Error);
-	});
-
-	it('should reject with error if protocol is unsupported', function() {
-		url = 'ftp://example.com/';
-		return expect(fetch(url)).to.eventually.be.rejectedWith(Error);
-	});
-
-	it('should reject with error on network failure', function() {
-		url = 'http://localhost:50000/';
-		return expect(fetch(url)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.include({ type: 'system', code: 'ECONNREFUSED', errno: 'ECONNREFUSED' });
-	});
-
-	it('should resolve into response', function() {
-		url = base + '/hello';
-		return fetch(url).then(function(res) {
-			expect(res).to.be.an.instanceof(Response);
-			expect(res.headers).to.be.an.instanceof(Headers);
-			expect(res.body).to.be.an.instanceof(stream.Transform);
-			expect(res.bodyUsed).to.be.false;
-
-			expect(res.url).to.equal(url);
-			expect(res.ok).to.be.true;
-			expect(res.status).to.equal(200);
-			expect(res.statusText).to.equal('OK');
-		});
-	});
-
-	it('should accept plain text response', function() {
-		url = base + '/plain';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(res.bodyUsed).to.be.true;
-				expect(result).to.be.a('string');
-				expect(result).to.equal('text');
-			});
-		});
-	});
-
-	it('should accept html response (like plain text)', function() {
-		url = base + '/html';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/html');
-			return res.text().then(function(result) {
-				expect(res.bodyUsed).to.be.true;
-				expect(result).to.be.a('string');
-				expect(result).to.equal('<html></html>');
-			});
-		});
-	});
-
-	it('should accept json response', function() {
-		url = base + '/json';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('application/json');
-			return res.json().then(function(result) {
-				expect(res.bodyUsed).to.be.true;
-				expect(result).to.be.an('object');
-				expect(result).to.deep.equal({ name: 'value' });
-			});
-		});
-	});
-
-	it('should send request with custom headers', function() {
-		url = base + '/inspect';
-		opts = {
-			headers: { 'x-custom-header': 'abc' }
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.headers['x-custom-header']).to.equal('abc');
-		});
-	});
-
-	it('should accept headers instance', function() {
-		url = base + '/inspect';
-		opts = {
-			headers: new Headers({ 'x-custom-header': 'abc' })
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.headers['x-custom-header']).to.equal('abc');
-		});
-	});
-
-	it('should accept custom host header', function() {
-		url = base + '/inspect';
-		opts = {
-			headers: {
-				host: 'example.com'
-			}
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.headers['host']).to.equal('example.com');
-		});
-	});
-
-	it('should follow redirect code 301', function() {
-		url = base + '/redirect/301';
-		return fetch(url).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-			expect(res.ok).to.be.true;
-		});
-	});
-
-	it('should follow redirect code 302', function() {
-		url = base + '/redirect/302';
-		return fetch(url).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should follow redirect code 303', function() {
-		url = base + '/redirect/303';
-		return fetch(url).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should follow redirect code 307', function() {
-		url = base + '/redirect/307';
-		return fetch(url).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should follow redirect code 308', function() {
-		url = base + '/redirect/308';
-		return fetch(url).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should follow redirect chain', function() {
-		url = base + '/redirect/chain';
-		return fetch(url).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should follow POST request redirect code 301 with GET', function() {
-		url = base + '/redirect/301';
-		opts = {
-			method: 'POST'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-			return res.json().then(function(result) {
-				expect(result.method).to.equal('GET');
-				expect(result.body).to.equal('');
-			});
-		});
-	});
-
-	it('should follow POST request redirect code 302 with GET', function() {
-		url = base + '/redirect/302';
-		opts = {
-			method: 'POST'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-			return res.json().then(function(result) {
-				expect(result.method).to.equal('GET');
-				expect(result.body).to.equal('');
-			});
-		});
-	});
-
-	it('should follow redirect code 303 with GET', function() {
-		url = base + '/redirect/303';
-		opts = {
-			method: 'PUT'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-			return res.json().then(function(result) {
-				expect(result.method).to.equal('GET');
-				expect(result.body).to.equal('');
-			});
-		});
-	});
-
-	it('should obey maximum redirect, reject case', function() {
-		url = base + '/redirect/chain';
-		opts = {
-			follow: 1
-		}
-		return expect(fetch(url, opts)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('type', 'max-redirect');
-	});
-
-	it('should obey redirect chain, resolve case', function() {
-		url = base + '/redirect/chain';
-		opts = {
-			follow: 2
-		}
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should allow not following redirect', function() {
-		url = base + '/redirect/301';
-		opts = {
-			follow: 0
-		}
-		return expect(fetch(url, opts)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('type', 'max-redirect');
-	});
-
-	it('should support redirect mode, manual flag', function() {
-		url = base + '/redirect/301';
-		opts = {
-			redirect: 'manual'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(url);
-			expect(res.status).to.equal(301);
-			expect(res.headers.get('location')).to.equal(base + '/inspect');
-		});
-	});
-
-	it('should support redirect mode, error flag', function() {
-		url = base + '/redirect/301';
-		opts = {
-			redirect: 'error'
-		};
-		return expect(fetch(url, opts)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('type', 'no-redirect');
-	});
-
-	it('should support redirect mode, manual flag when there is no redirect', function() {
-		url = base + '/hello';
-		opts = {
-			redirect: 'manual'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(url);
-			expect(res.status).to.equal(200);
-			expect(res.headers.get('location')).to.be.null;
-		});
-	});
-
-	it('should follow redirect code 301 and keep existing headers', function() {
-		url = base + '/redirect/301';
-		opts = {
-			headers: new Headers({ 'x-custom-header': 'abc' })
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(base + '/inspect');
-			return res.json();
-		}).then(function(res) {
-			expect(res.headers['x-custom-header']).to.equal('abc');
-		});
-	});
-
-	it('should reject broken redirect', function() {
-		url = base + '/error/redirect';
-		return expect(fetch(url)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('type', 'invalid-redirect');
-	});
-
-	it('should not reject broken redirect under manual redirect', function() {
-		url = base + '/error/redirect';
-		opts = {
-			redirect: 'manual'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.url).to.equal(url);
-			expect(res.status).to.equal(301);
-			expect(res.headers.get('location')).to.be.null;
-		});
-	});
-
-	it('should handle client-error response', function() {
-		url = base + '/error/400';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			expect(res.status).to.equal(400);
-			expect(res.statusText).to.equal('Bad Request');
-			expect(res.ok).to.be.false;
-			return res.text().then(function(result) {
-				expect(res.bodyUsed).to.be.true;
-				expect(result).to.be.a('string');
-				expect(result).to.equal('client error');
-			});
-		});
-	});
-
-	it('should handle server-error response', function() {
-		url = base + '/error/500';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			expect(res.status).to.equal(500);
-			expect(res.statusText).to.equal('Internal Server Error');
-			expect(res.ok).to.be.false;
-			return res.text().then(function(result) {
-				expect(res.bodyUsed).to.be.true;
-				expect(result).to.be.a('string');
-				expect(result).to.equal('server error');
-			});
-		});
-	});
-
-	it('should handle network-error response', function() {
-		url = base + '/error/reset';
-		return expect(fetch(url)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('code', 'ECONNRESET');
-	});
-
-	it('should handle DNS-error response', function() {
-		url = 'http://domain.invalid';
-		return expect(fetch(url)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('code', 'ENOTFOUND');
-	});
-
-	it('should reject invalid json response', function() {
-		url = base + '/error/json';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('application/json');
-			return expect(res.json()).to.eventually.be.rejectedWith(Error);
-		});
-	});
-
-	it('should handle no content response', function() {
-		url = base + '/no-content';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(204);
-			expect(res.statusText).to.equal('No Content');
-			expect(res.ok).to.be.true;
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.be.empty;
-			});
-		});
-	});
-
-	it('should throw on no-content json response', function() {
-		url = base + '/no-content';
-		return fetch(url).then(function(res) {
-			return expect(res.json()).to.eventually.be.rejectedWith(FetchError);
-		});
-	});
-
-	it('should handle no content response with gzip encoding', function() {
-		url = base + '/no-content/gzip';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(204);
-			expect(res.statusText).to.equal('No Content');
-			expect(res.headers.get('content-encoding')).to.equal('gzip');
-			expect(res.ok).to.be.true;
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.be.empty;
-			});
-		});
-	});
-
-	it('should handle not modified response', function() {
-		url = base + '/not-modified';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(304);
-			expect(res.statusText).to.equal('Not Modified');
-			expect(res.ok).to.be.false;
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.be.empty;
-			});
-		});
-	});
-
-	it('should handle not modified response with gzip encoding', function() {
-		url = base + '/not-modified/gzip';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(304);
-			expect(res.statusText).to.equal('Not Modified');
-			expect(res.headers.get('content-encoding')).to.equal('gzip');
-			expect(res.ok).to.be.false;
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.be.empty;
-			});
-		});
-	});
-
-	it('should decompress gzip response', function() {
-		url = base + '/gzip';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.equal('hello world');
-			});
-		});
-	});
-
-	it('should decompress deflate response', function() {
-		url = base + '/deflate';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.equal('hello world');
-			});
-		});
-	});
-
-	it('should decompress deflate raw response from old apache server', function() {
-		url = base + '/deflate-raw';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.equal('hello world');
-			});
-		});
-	});
-
-	it('should skip decompression if unsupported', function() {
-		url = base + '/sdch';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.equal('fake sdch string');
-			});
-		});
-	});
-
-	it('should reject if response compression is invalid', function() {
-		url = base + '/invalid-content-encoding';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return expect(res.text()).to.eventually.be.rejected
-				.and.be.an.instanceOf(FetchError)
-				.and.have.property('code', 'Z_DATA_ERROR');
-		});
-	});
-
-	it('should allow disabling auto decompression', function() {
-		url = base + '/gzip';
-		opts = {
-			compress: false
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(result).to.be.a('string');
-				expect(result).to.not.equal('hello world');
-			});
-		});
-	});
-
-	it('should allow custom timeout', function() {
-		this.timeout(500);
-		url = base + '/timeout';
-		opts = {
-			timeout: 100
-		};
-		return expect(fetch(url, opts)).to.eventually.be.rejected
-			.and.be.an.instanceOf(FetchError)
-			.and.have.property('type', 'request-timeout');
-	});
-
-	it('should allow custom timeout on response body', function() {
-		this.timeout(500);
-		url = base + '/slow';
-		opts = {
-			timeout: 100
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.ok).to.be.true;
-			return expect(res.text()).to.eventually.be.rejected
-				.and.be.an.instanceOf(FetchError)
-				.and.have.property('type', 'body-timeout');
-		});
-	});
-
-	it('should clear internal timeout on fetch response', function (done) {
-		this.timeout(1000);
-		spawn('node', ['-e', 'require("./")("' + base + '/hello", { timeout: 5000 })'])
-			.on('exit', function () {
-				done();
-			});
-	});
-
-	it('should clear internal timeout on fetch redirect', function (done) {
-		this.timeout(1000);
-		spawn('node', ['-e', 'require("./")("' + base + '/redirect/301", { timeout: 5000 })'])
-			.on('exit', function () {
-				done();
-			});
-	});
-
-	it('should clear internal timeout on fetch error', function (done) {
-		this.timeout(1000);
-		spawn('node', ['-e', 'require("./")("' + base + '/error/reset", { timeout: 5000 })'])
-			.on('exit', function () {
-				done();
-			});
-	});
-
-	it('should allow POST request', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'POST'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.headers['transfer-encoding']).to.be.undefined;
-			expect(res.headers['content-length']).to.equal('0');
-		});
-	});
-
-	it('should allow POST request with string body', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'POST'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.body).to.equal('a=1');
-			expect(res.headers['transfer-encoding']).to.be.undefined;
-			expect(res.headers['content-length']).to.equal('3');
-		});
-	});
-
-	it('should allow POST request with buffer body', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'POST'
-			, body: new Buffer('a=1', 'utf-8')
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.body).to.equal('a=1');
-			expect(res.headers['transfer-encoding']).to.equal('chunked');
-			expect(res.headers['content-length']).to.be.undefined;
-		});
-	});
-
-	it('should allow POST request with readable stream as body', function() {
-		var body = resumer().queue('a=1').end();
-		body = body.pipe(new stream.PassThrough());
-
-		url = base + '/inspect';
-		opts = {
-			method: 'POST'
-			, body: body
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.body).to.equal('a=1');
-			expect(res.headers['transfer-encoding']).to.equal('chunked');
-			expect(res.headers['content-length']).to.be.undefined;
-		});
-	});
-
-	it('should allow POST request with form-data as body', function() {
-		var form = new FormData();
-		form.append('a','1');
-
-		url = base + '/multipart';
-		opts = {
-			method: 'POST'
-			, body: form
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.headers['content-type']).to.contain('multipart/form-data');
-			expect(res.headers['content-length']).to.be.a('string');
-			expect(res.body).to.equal('a=1');
-		});
-	});
-
-	it('should allow POST request with form-data using stream as body', function() {
-		var form = new FormData();
-		form.append('my_field', fs.createReadStream('test/dummy.txt'));
-
-		url = base + '/multipart';
-		opts = {
-			method: 'POST'
-			, body: form
-		};
-
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.headers['content-type']).to.contain('multipart/form-data');
-			expect(res.headers['content-length']).to.be.undefined;
-			expect(res.body).to.contain('my_field=');
-		});
-	});
-
-	it('should allow POST request with form-data as body and custom headers', function() {
-		var form = new FormData();
-		form.append('a','1');
-
-		var headers = form.getHeaders();
-		headers['b'] = '2';
-
-		url = base + '/multipart';
-		opts = {
-			method: 'POST'
-			, body: form
-			, headers: headers
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.headers['content-type']).to.contain('multipart/form-data');
-			expect(res.headers['content-length']).to.be.a('string');
-			expect(res.headers.b).to.equal('2');
-			expect(res.body).to.equal('a=1');
-		});
-	});
-
-	it('should allow POST request with object body', function() {
-		url = base + '/inspect';
-		// note that fetch simply calls tostring on an object
-		opts = {
-			method: 'POST'
-			, body: { a:1 }
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.body).to.equal('[object Object]');
-		});
-	});
-
-	it('should allow PUT request', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'PUT'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('PUT');
-			expect(res.body).to.equal('a=1');
-		});
-	});
-
-	it('should allow DELETE request', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'DELETE'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('DELETE');
-		});
-	});
-
-	it('should allow POST request with string body', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'POST'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('POST');
-			expect(res.body).to.equal('a=1');
-			expect(res.headers['transfer-encoding']).to.be.undefined;
-			expect(res.headers['content-length']).to.equal('3');
-		});
-	});
-
-	it('should allow DELETE request with string body', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'DELETE'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('DELETE');
-			expect(res.body).to.equal('a=1');
-			expect(res.headers['transfer-encoding']).to.be.undefined;
-			expect(res.headers['content-length']).to.equal('3');
-		});
-	});
-
-	it('should allow PATCH request', function() {
-		url = base + '/inspect';
-		opts = {
-			method: 'PATCH'
-			, body: 'a=1'
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.method).to.equal('PATCH');
-			expect(res.body).to.equal('a=1');
-		});
-	});
-
-	it('should allow HEAD request', function() {
-		url = base + '/hello';
-		opts = {
-			method: 'HEAD'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.status).to.equal(200);
-			expect(res.statusText).to.equal('OK');
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			expect(res.body).to.be.an.instanceof(stream.Transform);
-			return res.text();
-		}).then(function(text) {
-			expect(text).to.equal('');
-		});
-	});
-
-	it('should allow HEAD request with content-encoding header', function() {
-		url = base + '/error/404';
-		opts = {
-			method: 'HEAD'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.status).to.equal(404);
-			expect(res.headers.get('content-encoding')).to.equal('gzip');
-			return res.text();
-		}).then(function(text) {
-			expect(text).to.equal('');
-		});
-	});
-
-	it('should allow OPTIONS request', function() {
-		url = base + '/options';
-		opts = {
-			method: 'OPTIONS'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.status).to.equal(200);
-			expect(res.statusText).to.equal('OK');
-			expect(res.headers.get('allow')).to.equal('GET, HEAD, OPTIONS');
-			expect(res.body).to.be.an.instanceof(stream.Transform);
-		});
-	});
-
-	it('should reject decoding body twice', function() {
-		url = base + '/plain';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return res.text().then(function(result) {
-				expect(res.bodyUsed).to.be.true;
-				return expect(res.text()).to.eventually.be.rejectedWith(Error);
-			});
-		});
-	});
-
-	it('should support maximum response size, multiple chunk', function() {
-		url = base + '/size/chunk';
-		opts = {
-			size: 5
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.status).to.equal(200);
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return expect(res.text()).to.eventually.be.rejected
-				.and.be.an.instanceOf(FetchError)
-				.and.have.property('type', 'max-size');
-		});
-	});
-
-	it('should support maximum response size, single chunk', function() {
-		url = base + '/size/long';
-		opts = {
-			size: 5
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.status).to.equal(200);
-			expect(res.headers.get('content-type')).to.equal('text/plain');
-			return expect(res.text()).to.eventually.be.rejected
-				.and.be.an.instanceOf(FetchError)
-				.and.have.property('type', 'max-size');
-		});
-	});
-
-	it('should support encoding decode, xml dtd detect', function() {
-		url = base + '/encoding/euc-jp';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			return res.text().then(function(result) {
-				expect(result).to.equal('<?xml version="1.0" encoding="EUC-JP"?><title>日本語</title>');
-			});
-		});
-	});
-
-	it('should support encoding decode, content-type detect', function() {
-		url = base + '/encoding/shift-jis';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			return res.text().then(function(result) {
-				expect(result).to.equal('<div>日本語</div>');
-			});
-		});
-	});
-
-	it('should support encoding decode, html5 detect', function() {
-		url = base + '/encoding/gbk';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			return res.text().then(function(result) {
-				expect(result).to.equal('<meta charset="gbk"><div>中文</div>');
-			});
-		});
-	});
-
-	it('should support encoding decode, html4 detect', function() {
-		url = base + '/encoding/gb2312';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			return res.text().then(function(result) {
-				expect(result).to.equal('<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><div>中文</div>');
-			});
-		});
-	});
-
-	it('should default to utf8 encoding', function() {
-		url = base + '/encoding/utf8';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			expect(res.headers.get('content-type')).to.be.null;
-			return res.text().then(function(result) {
-				expect(result).to.equal('中文');
-			});
-		});
-	});
-
-	it('should support uncommon content-type order, charset in front', function() {
-		url = base + '/encoding/order1';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			return res.text().then(function(result) {
-				expect(result).to.equal('中文');
-			});
-		});
-	});
-
-	it('should support uncommon content-type order, end with qs', function() {
-		url = base + '/encoding/order2';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			return res.text().then(function(result) {
-				expect(result).to.equal('中文');
-			});
-		});
-	});
-
-	it('should support chunked encoding, html4 detect', function() {
-		url = base + '/encoding/chunked';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			// because node v0.12 doesn't have str.repeat
-			var padding = new Array(10 + 1).join('a');
-			return res.text().then(function(result) {
-				expect(result).to.equal(padding + '<meta http-equiv="Content-Type" content="text/html; charset=Shift_JIS" /><div>日本語</div>');
-			});
-		});
-	});
-
-	it('should only do encoding detection up to 1024 bytes', function() {
-		url = base + '/encoding/invalid';
-		return fetch(url).then(function(res) {
-			expect(res.status).to.equal(200);
-			// because node v0.12 doesn't have str.repeat
-			var padding = new Array(1200 + 1).join('a');
-			return res.text().then(function(result) {
-				expect(result).to.not.equal(padding + '中文');
-			});
-		});
-	});
-
-	it('should allow piping response body as stream', function(done) {
-		url = base + '/hello';
-		fetch(url).then(function(res) {
-			expect(res.body).to.be.an.instanceof(stream.Transform);
-			res.body.on('data', function(chunk) {
-				if (chunk === null) {
-					return;
-				}
-				expect(chunk.toString()).to.equal('world');
-			});
-			res.body.on('end', function() {
-				done();
-			});
-		});
-	});
-
-	it('should allow cloning a response, and use both as stream', function(done) {
-		url = base + '/hello';
-		return fetch(url).then(function(res) {
-			var counter = 0;
-			var r1 = res.clone();
-			expect(res.body).to.be.an.instanceof(stream.Transform);
-			expect(r1.body).to.be.an.instanceof(stream.Transform);
-			res.body.on('data', function(chunk) {
-				if (chunk === null) {
-					return;
-				}
-				expect(chunk.toString()).to.equal('world');
-			});
-			res.body.on('end', function() {
-				counter++;
-				if (counter == 2) {
-					done();
-				}
-			});
-			r1.body.on('data', function(chunk) {
-				if (chunk === null) {
-					return;
-				}
-				expect(chunk.toString()).to.equal('world');
-			});
-			r1.body.on('end', function() {
-				counter++;
-				if (counter == 2) {
-					done();
-				}
-			});
-		});
-	});
-
-	it('should allow cloning a json response and log it as text response', function() {
-		url = base + '/json';
-		return fetch(url).then(function(res) {
-			var r1 = res.clone();
-			return fetch.Promise.all([res.json(), r1.text()]).then(function(results) {
-				expect(results[0]).to.deep.equal({name: 'value'});
-				expect(results[1]).to.equal('{"name":"value"}');
-			});
-		});
-	});
-
-	it('should allow cloning a json response, and then log it as text response', function() {
-		url = base + '/json';
-		return fetch(url).then(function(res) {
-			var r1 = res.clone();
-			return res.json().then(function(result) {
-				expect(result).to.deep.equal({name: 'value'});
-				return r1.text().then(function(result) {
-					expect(result).to.equal('{"name":"value"}');
-				});
-			});
-		});
-	});
-
-	it('should allow cloning a json response, first log as text response, then return json object', function() {
-		url = base + '/json';
-		return fetch(url).then(function(res) {
-			var r1 = res.clone();
-			return r1.text().then(function(result) {
-				expect(result).to.equal('{"name":"value"}');
-				return res.json().then(function(result) {
-					expect(result).to.deep.equal({name: 'value'});
-				});
-			});
-		});
-	});
-
-	it('should not allow cloning a response after its been used', function() {
-		url = base + '/hello';
-		return fetch(url).then(function(res) {
-			return res.text().then(function(result) {
-				expect(function() {
-					var r1 = res.clone();
-				}).to.throw(Error);
-			});
-		})
-	});
-
-	it('should allow get all responses of a header', function() {
-		url = base + '/cookie';
-		return fetch(url).then(function(res) {
-			expect(res.headers.get('set-cookie')).to.equal('a=1');
-			expect(res.headers.get('Set-Cookie')).to.equal('a=1');
-			expect(res.headers.getAll('set-cookie')).to.deep.equal(['a=1', 'b=1']);
-			expect(res.headers.getAll('Set-Cookie')).to.deep.equal(['a=1', 'b=1']);
-		});
-	});
-
-	it('should allow iterating through all headers', function() {
-		var headers = new Headers({
-			a: 1
-			, b: [2, 3]
-			, c: [4]
-		});
-		expect(headers).to.have.property('forEach');
-
-		var result = [];
-		headers.forEach(function(val, key) {
-			result.push([key, val]);
-		});
-
-		expected = [
-			["a", "1"]
-			, ["b", "2"]
-			, ["b", "3"]
-			, ["c", "4"]
-		];
-		expect(result).to.deep.equal(expected);
-	});
-
-	it('should allow deleting header', function() {
-		url = base + '/cookie';
-		return fetch(url).then(function(res) {
-			res.headers.delete('set-cookie');
-			expect(res.headers.get('set-cookie')).to.be.null;
-			expect(res.headers.getAll('set-cookie')).to.be.empty;
-		});
-	});
-
-	it('should send request with connection keep-alive if agent is provided', function() {
-		url = base + '/inspect';
-		opts = {
-			agent: new http.Agent({
-				keepAlive: true
-			})
-		};
-		return fetch(url, opts).then(function(res) {
-			return res.json();
-		}).then(function(res) {
-			expect(res.headers['connection']).to.equal('keep-alive');
-		});
-	});
-
-	it('should ignore unsupported attributes while reading headers', function() {
-		var FakeHeader = function() {};
-		// prototypes are ignored
-		FakeHeader.prototype.z = 'fake';
-
-		var res = new FakeHeader;
-		// valid
-		res.a = 'string';
-		res.b = ['1','2'];
-		res.c = '';
-		res.d = [];
-		// common mistakes, normalized
-		res.e = 1;
-		res.f = [1, 2];
-		// invalid, ignored
-		res.g = { a:1 };
-		res.h = undefined;
-		res.i = null;
-		res.j = NaN;
-		res.k = true;
-		res.l = false;
-		res.m = new Buffer('test');
-
-		var h1 = new Headers(res);
-
-		expect(h1._headers['a']).to.include('string');
-		expect(h1._headers['b']).to.include('1');
-		expect(h1._headers['b']).to.include('2');
-		expect(h1._headers['c']).to.include('');
-		expect(h1._headers['d']).to.be.undefined;
-
-		expect(h1._headers['e']).to.include('1');
-		expect(h1._headers['f']).to.include('1');
-		expect(h1._headers['f']).to.include('2');
-
-		expect(h1._headers['g']).to.be.undefined;
-		expect(h1._headers['h']).to.be.undefined;
-		expect(h1._headers['i']).to.be.undefined;
-		expect(h1._headers['j']).to.be.undefined;
-		expect(h1._headers['k']).to.be.undefined;
-		expect(h1._headers['l']).to.be.undefined;
-		expect(h1._headers['m']).to.be.undefined;
-
-		expect(h1._headers['z']).to.be.undefined;
-	});
-
-	it('should wrap headers', function() {
-		var h1 = new Headers({
-			a: '1'
-		});
-
-		var h2 = new Headers(h1);
-		h2.set('b', '1');
-
-		var h3 = new Headers(h2);
-		h3.append('a', '2');
-
-		expect(h1._headers['a']).to.include('1');
-		expect(h1._headers['a']).to.not.include('2');
-
-		expect(h2._headers['a']).to.include('1');
-		expect(h2._headers['a']).to.not.include('2');
-		expect(h2._headers['b']).to.include('1');
-
-		expect(h3._headers['a']).to.include('1');
-		expect(h3._headers['a']).to.include('2');
-		expect(h3._headers['b']).to.include('1');
-	});
-
-	it('should support fetch with Request instance', function() {
-		url = base + '/hello';
-		var req = new Request(url);
-		return fetch(req).then(function(res) {
-			expect(res.url).to.equal(url);
-			expect(res.ok).to.be.true;
-			expect(res.status).to.equal(200);
-		});
-	});
-
-	it('should support wrapping Request instance', function() {
-		url = base + '/hello';
-
-		var form = new FormData();
-		form.append('a', '1');
-
-		var r1 = new Request(url, {
-			method: 'POST'
-			, follow: 1
-			, body: form
-		});
-		var r2 = new Request(r1, {
-			follow: 2
-		});
-
-		expect(r2.url).to.equal(url);
-		expect(r2.method).to.equal('POST');
-		// note that we didn't clone the body
-		expect(r2.body).to.equal(form);
-		expect(r1.follow).to.equal(1);
-		expect(r2.follow).to.equal(2);
-		expect(r1.counter).to.equal(0);
-		expect(r2.counter).to.equal(0);
-	});
-
-	it('should support overwrite Request instance', function() {
-		url = base + '/inspect';
-		var req = new Request(url, {
-			method: 'POST'
-			, headers: {
-				a: '1'
-			}
-		});
-		return fetch(req, {
-			method: 'GET'
-			, headers: {
-				a: '2'
-			}
-		}).then(function(res) {
-			return res.json();
-		}).then(function(body) {
-			expect(body.method).to.equal('GET');
-			expect(body.headers.a).to.equal('2');
-		});
-	});
-
-	it('should support empty options in Response constructor', function() {
-		var body = resumer().queue('a=1').end();
-		body = body.pipe(new stream.PassThrough());
-		var res = new Response(body);
-		return res.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should support parsing headers in Response constructor', function() {
-		var res = new Response(null, {
-			headers: {
-				a: '1'
-			}
-		});
-		expect(res.headers.get('a')).to.equal('1');
-	});
-
-	it('should support text() method in Response constructor', function() {
-		var res = new Response('a=1');
-		return res.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should support json() method in Response constructor', function() {
-		var res = new Response('{"a":1}');
-		return res.json().then(function(result) {
-			expect(result.a).to.equal(1);
-		});
-	});
-
-	it('should support buffer() method in Response constructor', function() {
-		var res = new Response('a=1');
-		return res.buffer().then(function(result) {
-			expect(result.toString()).to.equal('a=1');
-		});
-	});
-
-	it('should support clone() method in Response constructor', function() {
-		var body = resumer().queue('a=1').end();
-		body = body.pipe(new stream.PassThrough());
-		var res = new Response(body, {
-			headers: {
-				a: '1'
-			}
-			, url: base
-			, status: 346
-			, statusText: 'production'
-		});
-		var cl = res.clone();
-		expect(cl.headers.get('a')).to.equal('1');
-		expect(cl.url).to.equal(base);
-		expect(cl.status).to.equal(346);
-		expect(cl.statusText).to.equal('production');
-		expect(cl.ok).to.be.false;
-		// clone body shouldn't be the same body
-		expect(cl.body).to.not.equal(body);
-		return cl.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should support stream as body in Response constructor', function() {
-		var body = resumer().queue('a=1').end();
-		body = body.pipe(new stream.PassThrough());
-		var res = new Response(body);
-		return res.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should support string as body in Response constructor', function() {
-		var res = new Response('a=1');
-		return res.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should support buffer as body in Response constructor', function() {
-		var res = new Response(new Buffer('a=1'));
-		return res.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should default to 200 as status code', function() {
-		var res = new Response(null);
-		expect(res.status).to.equal(200);
-	});
-
-	it('should support parsing headers in Request constructor', function() {
-		url = base;
-		var req = new Request(url, {
-			headers: {
-				a: '1'
-			}
-		});
-		expect(req.url).to.equal(url);
-		expect(req.headers.get('a')).to.equal('1');
-	});
-
-	it('should support text() method in Request constructor', function() {
-		url = base;
-		var req = new Request(url, {
-			body: 'a=1'
-		});
-		expect(req.url).to.equal(url);
-		return req.text().then(function(result) {
-			expect(result).to.equal('a=1');
-		});
-	});
-
-	it('should support json() method in Request constructor', function() {
-		url = base;
-		var req = new Request(url, {
-			body: '{"a":1}'
-		});
-		expect(req.url).to.equal(url);
-		return req.json().then(function(result) {
-			expect(result.a).to.equal(1);
-		});
-	});
-
-	it('should support buffer() method in Request constructor', function() {
-		url = base;
-		var req = new Request(url, {
-			body: 'a=1'
-		});
-		expect(req.url).to.equal(url);
-		return req.buffer().then(function(result) {
-			expect(result.toString()).to.equal('a=1');
-		});
-	});
-
-	it('should support arbitrary url in Request constructor', function() {
-		url = 'anything';
-		var req = new Request(url);
-		expect(req.url).to.equal('anything');
-	});
-
-	it('should support clone() method in Request constructor', function() {
-		url = base;
-		var body = resumer().queue('a=1').end();
-		body = body.pipe(new stream.PassThrough());
-		var agent = new http.Agent();
-		var req = new Request(url, {
-			body: body
-			, method: 'POST'
-			, redirect: 'manual'
-			, headers: {
-				b: '2'
-			}
-			, follow: 3
-			, compress: false
-			, agent: agent
-		});
-		var cl = req.clone();
-		expect(cl.url).to.equal(url);
-		expect(cl.method).to.equal('POST');
-		expect(cl.redirect).to.equal('manual');
-		expect(cl.headers.get('b')).to.equal('2');
-		expect(cl.follow).to.equal(3);
-		expect(cl.compress).to.equal(false);
-		expect(cl.method).to.equal('POST');
-		expect(cl.counter).to.equal(0);
-		expect(cl.agent).to.equal(agent);
-		// clone body shouldn't be the same body
-		expect(cl.body).to.not.equal(body);
-		return fetch.Promise.all([cl.text(), req.text()]).then(function(results) {
-			expect(results[0]).to.equal('a=1');
-			expect(results[1]).to.equal('a=1');
-		});
-	});
-
-	it('should support text(), json() and buffer() method in Body constructor', function() {
-		var body = new Body('a=1');
-		expect(body).to.have.property('text');
-		expect(body).to.have.property('json');
-		expect(body).to.have.property('buffer');
-	});
-
-	it('should create custom FetchError', function() {
-		var systemError = new Error('system');
-		systemError.code = 'ESOMEERROR';
-
-		var err = new FetchError('test message', 'test-error', systemError);
-		expect(err).to.be.an.instanceof(Error);
-		expect(err).to.be.an.instanceof(FetchError);
-		expect(err.name).to.equal('FetchError');
-		expect(err.message).to.equal('test message');
-		expect(err.type).to.equal('test-error');
-		expect(err.code).to.equal('ESOMEERROR');
-		expect(err.errno).to.equal('ESOMEERROR');
-	});
-
-	it('should support https request', function() {
-		this.timeout(5000);
-		url = 'https://github.com/';
-		opts = {
-			method: 'HEAD'
-		};
-		return fetch(url, opts).then(function(res) {
-			expect(res.status).to.equal(200);
-			expect(res.ok).to.be.true;
-		});
-	});
-
-});