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net/http: only disable fetch in test #69289

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net/http: only disable fetch in test #69289

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net/http: only disable fetch in test
Zxilly Sep 5, 2024
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Zxilly Sep 6, 2024
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10 changes: 10 additions & 0 deletions lib/wasm/wasm_exec_node.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,16 @@ globalThis.crypto ??= require("crypto");

require("./wasm_exec");

// Disable fetch API in tests so that
// RoundTrip ends up talking over the same fake
// network the HTTP servers currently use in
// various tests and examples.
// See net/http/roundtrip_js.go.
// See go.dev/issue/57613.
if (process.argv[2].endsWith(".test")) {
globalThis["JSFetchDisabledInTest"] = true;
}

const go = new Go();
go.argv = process.argv.slice(2);
go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
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6 changes: 2 additions & 4 deletions src/net/http/roundtrip_js.go
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Expand Up @@ -12,7 +12,6 @@ import (
"io"
"net/http/internal/ascii"
"strconv"
"strings"
"syscall/js"
)

Expand Down Expand Up @@ -47,14 +46,13 @@ const jsFetchRedirect = "js.fetch:redirect"
var jsFetchMissing = js.Global().Get("fetch").IsUndefined()

// jsFetchDisabled controls whether the use of Fetch API is disabled.
// It's set to true when we detect we're running in Node.js, so that
// It's set to true when we detect we're running in test, so that
// RoundTrip ends up talking over the same fake network the HTTP servers
// currently use in various tests and examples. See go.dev/issue/57613.
//
// TODO(go.dev/issue/60810): See if it's viable to test the Fetch API
// code path.
var jsFetchDisabled = js.Global().Get("process").Type() == js.TypeObject &&
strings.HasPrefix(js.Global().Get("process").Get("argv0").String(), "node")
var jsFetchDisabled = !js.Global().Get("JSFetchDisabledInTest").IsUndefined()

// RoundTrip implements the [RoundTripper] interface using the WHATWG Fetch API.
func (t *Transport) RoundTrip(req *Request) (*Response, error) {
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