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dmitshurdmitshur
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compiler/natives/src/net/http: Implement http.RoundTripper using Fetch API.
The motivation to use Fetch API is because it's lower level, and allows implementing an http.RoundTripper more efficiently (less conversions between strings and []byte). It also supports streaming body responses efficiently. req.Cancel is partially supported; it gets RoundTrip to return right away, but may not cancel the underlying request that the browser will make. It is still on the roadmap for Fetch API to add support for canceling requests, once done, this can be improved. CancelRequest(*http.Request) is not implemented because that method is deprecated. Dynamically determine which of Fetch, XMLHttpRequest APIs are available and gracefully fallback to the best available API, if any. Tested in stable channel of Chrome, latest Safari, Firefox (developer edition). Only stable Chrome appears to support Fetch API with streaming response bodies at time of testing (Firefox supports Fetch API but not yet streaming response bodies), but all modern browsers have WIP implementations at HEAD, so it's only a matter of time before they (seamlessly) benefit from this patch. References: - https://fetch.spec.whatwg.org/ - https://streams.spec.whatwg.org/ - http://caniuse.com/#search=Fetch Regenerate compiler/natives/fs_vfsdata.go: go generate github.com/gopherjs/gopherjs/... Closes #454.
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