Implemented a default whitelist

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+
+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