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Improve detection of streaming request support (#581) #582

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Jun 25, 2024
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27 changes: 18 additions & 9 deletions source/core/constants.ts
Original file line number Diff line number Diff line change
Expand Up @@ -9,15 +9,24 @@ export const supportsRequestStreams = (() => {
const supportsRequest = typeof globalThis.Request === 'function';

if (supportsReadableStream && supportsRequest) {
hasContentType = new globalThis.Request('https://empty.invalid', {
body: new globalThis.ReadableStream(),
method: 'POST',
// @ts-expect-error - Types are outdated.
get duplex() {
duplexAccessed = true;
return 'half';
},
}).headers.has('Content-Type');
try {
hasContentType = new globalThis.Request('https://empty.invalid', {
body: new globalThis.ReadableStream(),
method: 'POST',
// @ts-expect-error - Types are outdated.
get duplex() {
duplexAccessed = true;
return 'half';
},
}).headers.has('Content-Type');
} catch (error) {
// QQBrowser on iOS throws "unsupported BodyInit type" error (see issue #581)
if (error instanceof Error && error.message === 'unsupported BodyInit type') {
return false;
}

throw error;
}
}

return duplexAccessed && !hasContentType;
Expand Down