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net/http: support configuring fetch options

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The default WASM RoundTripper is implemented using
the browser Fetch API. Some options don't readily map to
existing http.Request options, so we use the precedent
set by the TrailerPrefix constant to allow a user to configure
the "mode" and "credentials" options by supplying them
as headers in the http.Request.

Updates #26769
This commit is contained in:
Johan Brandhorst 2018-08-03 10:22:27 +01:00
parent 4cc09cd532
commit b230502084
1 changed files with 31 additions and 7 deletions
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38
src/net/http/roundtrip_js.go
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@ -17,17 +17,27 @@ import (
"syscall/js"
)
// ModeHeader is a Request.Header map key that, if present,
// signals that the map entry is actually an option to the Fetch API mode setting.
// Valid values are: "cors", "no-cors", "same-origin", "navigate"
// The default is "same-origin".
//
// Reference: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters
const ModeHeader = "Fetch:Mode"
// CredentialsHeader is a Request.Header map key that, if present,
// signals that the map entry is actually an option to the Fetch API credentials setting.
// Valid values are: "omit", "same-origin", "include"
// The default is "same-origin".
//
// Reference: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters
const CredentialsHeader = "Fetch:Credentials"
// RoundTrip implements the RoundTripper interface using the WHATWG Fetch API.
func (t *Transport) RoundTrip(req *Request) (*Response, error) {
if useFakeNetwork() {
return t.roundTrip(req)
}
headers := js.Global().Get("Headers").New()
for key, values := range req.Header {
for _, value := range values {
headers.Call("append", key, value)
}
}
ac := js.Global().Get("AbortController")
if ac != js.Undefined() {
@ -40,12 +50,26 @@ func (t *Transport) RoundTrip(req *Request) (*Response, error) {
opt := js.Global().Get("Object").New()
// See https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
// for options available.
opt.Set("headers", headers)
opt.Set("method", req.Method)
opt.Set("credentials", "same-origin")
if h := req.Header.Get(CredentialsHeader); h != "" {
opt.Set("credentials", h)
req.Header.Del(CredentialsHeader)
}
if h := req.Header.Get(ModeHeader); h != "" {
opt.Set("credentials", h)
req.Header.Del(ModeHeader)
}
if ac != js.Undefined() {
opt.Set("signal", ac.Get("signal"))
}
headers := js.Global().Get("Headers").New()
for key, values := range req.Header {
for _, value := range values {
headers.Call("append", key, value)
}
}
opt.Set("headers", headers)
if req.Body != nil {
// TODO(johanbrandhorst): Stream request body when possible.