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/**
* Clones a response by teeing the body so we can return two independent
* ReadableStreams from it. This avoids the bug in the undici library around
* response cloning.
*
* After cloning, the original response's body will be consumed and closed.
*
* @see https://github.com/vercel/next.js/pull/73274
*
* @param original - The original response to clone.
* @returns A tuple containing two independent clones of the original response.
*/
export function cloneResponse(original: Response): [Response, Response] {
// If the response has no body, then we can just return the original response
// twice because it's immutable.
if (!original.body) {
return [original, original]
}
const [body1, body2] = original.body.tee()
const cloned1 = new Response(body1, {
status: original.status,
statusText: original.statusText,
headers: original.headers,
})
Object.defineProperty(cloned1, 'url', {
value: original.url,
// How the original response.url behaves
configurable: true,
enumerable: true,
writable: false,
})
const cloned2 = new Response(body2, {
status: original.status,
statusText: original.statusText,
headers: original.headers,
})
Object.defineProperty(cloned2, 'url', {
value: original.url,
// How the original response.url behaves
configurable: true,
enumerable: true,
writable: false,
})
return [cloned1, cloned2]
}
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