var jsFetchDisabled = js.Global().Get("process").Type() == js.TypeObject &&
strings.HasPrefix(js.Global().Get("process").Get("argv0").String(), "node")
-// Determine whether the JS runtime supports streaming request bodies.
-// Courtesy: https://developer.chrome.com/articles/fetch-streaming-requests/#feature-detection
-func supportsPostRequestStreams() bool {
- requestOpt := js.Global().Get("Object").New()
- requestBody := js.Global().Get("ReadableStream").New()
-
- requestOpt.Set("method", "POST")
- requestOpt.Set("body", requestBody)
-
- // There is quite a dance required to define a getter if you do not have the { get property() { ... } }
- // syntax available. However, it is possible:
- // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get#defining_a_getter_on_existing_objects_using_defineproperty
- duplexCalled := false
- duplexGetterObj := js.Global().Get("Object").New()
- duplexGetterFunc := js.FuncOf(func(this js.Value, args []js.Value) any {
- duplexCalled = true
- return "half"
- })
- defer duplexGetterFunc.Release()
- duplexGetterObj.Set("get", duplexGetterFunc)
- js.Global().Get("Object").Call("defineProperty", requestOpt, "duplex", duplexGetterObj)
-
- // Slight difference here between the aforementioned example: Non-browser-based runtimes
- // do not have a non-empty API Base URL (https://html.spec.whatwg.org/multipage/webappapis.html#api-base-url)
- // so we have to supply a valid URL here.
- requestObject := js.Global().Get("Request").New("https://www.example.org", requestOpt)
-
- hasContentTypeHeader := requestObject.Get("headers").Call("has", "Content-Type").Bool()
-
- return duplexCalled && !hasContentTypeHeader
-}
-
// RoundTrip implements the RoundTripper interface using the WHATWG Fetch API.
func (t *Transport) RoundTrip(req *Request) (*Response, error) {
// The Transport has a documented contract that states that if the DialContext or
opt.Set("headers", headers)
if req.Body != nil {
- if !supportsPostRequestStreams() {
- body, err := io.ReadAll(req.Body)
- if err != nil {
- req.Body.Close() // RoundTrip must always close the body, including on errors.
- return nil, err
- }
- req.Body.Close()
- if len(body) != 0 {
- buf := uint8Array.New(len(body))
- js.CopyBytesToJS(buf, body)
- opt.Set("body", buf)
- }
- } else {
- readableStreamCtorArg := js.Global().Get("Object").New()
- readableStreamCtorArg.Set("type", "bytes")
- readableStreamCtorArg.Set("autoAllocateChunkSize", t.writeBufferSize())
-
- readableStreamPull := js.FuncOf(func(this js.Value, args []js.Value) any {
- controller := args[0]
- byobRequest := controller.Get("byobRequest")
- if byobRequest.IsNull() {
- controller.Call("close")
- }
-
- byobRequestView := byobRequest.Get("view")
-
- bodyBuf := make([]byte, byobRequestView.Get("byteLength").Int())
- readBytes, readErr := io.ReadFull(req.Body, bodyBuf)
- if readBytes > 0 {
- buf := uint8Array.New(byobRequestView.Get("buffer"))
- js.CopyBytesToJS(buf, bodyBuf)
- byobRequest.Call("respond", readBytes)
- }
-
- if readErr == io.EOF || readErr == io.ErrUnexpectedEOF {
- controller.Call("close")
- } else if readErr != nil {
- readErrCauseObject := js.Global().Get("Object").New()
- readErrCauseObject.Set("cause", readErr.Error())
- readErr := js.Global().Get("Error").New("io.ReadFull failed while streaming POST body", readErrCauseObject)
- controller.Call("error", readErr)
- }
- // Note: This a return from the pull callback of the controller and *not* RoundTrip().
- return nil
- })
- defer func() {
- readableStreamPull.Release()
- req.Body.Close()
- }()
- readableStreamCtorArg.Set("pull", readableStreamPull)
-
- opt.Set("body", js.Global().Get("ReadableStream").New(readableStreamCtorArg))
- // There is a requirement from the WHATWG fetch standard that the duplex property of
- // the object given as the options argument to the fetch call be set to 'half'
- // when the body property of the same options object is a ReadableStream:
- // https://fetch.spec.whatwg.org/#dom-requestinit-duplex
- opt.Set("duplex", "half")
+ // TODO(johanbrandhorst): Stream request body when possible.
+ // See https://bugs.chromium.org/p/chromium/issues/detail?id=688906 for Blink issue.
+ // See https://bugzilla.mozilla.org/show_bug.cgi?id=1387483 for Firefox issue.
+ // See https://github.com/web-platform-tests/wpt/issues/7693 for WHATWG tests issue.
+ // See https://developer.mozilla.org/en-US/docs/Web/API/Streams_API for more details on the Streams API
+ // and browser support.
+ // NOTE(haruyama480): Ensure HTTP/1 fallback exists.
+ // See https://go.dev/issue/61889 for discussion.
+ body, err := io.ReadAll(req.Body)
+ if err != nil {
+ req.Body.Close() // RoundTrip must always close the body, including on errors.
+ return nil, err
+ }
+ req.Body.Close()
+ if len(body) != 0 {
+ buf := uint8Array.New(len(body))
+ js.CopyBytesToJS(buf, body)
+ opt.Set("body", buf)
}
}