How to use streamText.toDataStreamResponse() with FastAPI endpoint?

[muke5hy]

Following code I am using to query my fastAPI endpoint to fetch data

As 'StreamingTextResponse' is deprecated how do I use streamText.toDataStreamResponse()

export const POST = (async ({ request, locals: { auth } }) => {
	const json = await request.json();
	const session = await auth();
	const url = `${API_URL}/api/chat/stream`
	const question = getLastUserMessage(json)
	const response = await fetch(url, {
		method: 'POST',
		headers: {
			'Content-Type': 'application/json',
			'x-user-id': `${session?.user?.id}`,
		},
		body: JSON.stringify({ "question": question, "id": json.id }),
	});

	if (!response.ok) {
		throw new Error(`HTTP error! status: ${response.status}`);
	}

	const stream = response.body;
	return new StreamingTextResponse(stream);

}) satisfies RequestHandler;

[lgrammel]

In your case, StreamingTextResponse is not doing anything special. You can just return a regular JS Response object:

return new Response(stream, {
  status: 200,
  contentType: 'text/plain; charset=utf-8',
})

[kimchankwon]

How do I read it from the frontend?