firefox-main/testing/web-platform/mozilla/tests/fetch/api/request/request-init-stream-pref-off.any.js (file symbol)

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// META: global=window,worker
// dom.fetch.streaming_upload is forced off for this file; see the .ini next to
// it. ReadableStream is a member of the BodyInit union unconditionally, because
// WebIDL typedefs cannot be pref-gated, so with the feature off a stream body
// converts to a USVString the way the union did before streaming upload was
// implemented.
function newStream() {
return new ReadableStream({
start(c) {
c.enqueue(new TextEncoder().encode("hello"));
c.close();
},
});
}
test(() => {
assert_false(
"duplex" in Request.prototype,
"the pref is off, so Request.duplex must not be exposed"
);
}, "The streaming upload pref is off for this file");
promise_test(async () => {
const request = new Request("/", { method: "POST", body: newStream() });
assert_equals(
request.headers.get("content-type"),
"text/plain;charset=UTF-8",
"a stringified body is sent as text/plain"
);
assert_equals(
await request.text(),
"[object ReadableStream]",
"the stream is stringified rather than read"
);
}, "With streaming upload disabled a ReadableStream body is stringified");
promise_test(async () => {
const stream = newStream();
new Request("/", { method: "POST", body: stream });
assert_false(stream.locked, "the stream must not be locked");
// Never consumed, so it is still fully readable.
const { value } = await stream.getReader().read();
assert_equals(new TextDecoder().decode(value), "hello");
}, "With streaming upload disabled a ReadableStream body is left untouched");