= request.nextUrl.searchParams; const readKey = searchParams.get('readKey'); if (!readKey) { return new Response('bad request', { status: 400 }); } const iterator = readPolling(readKey); const stream = iteratorToStream(iterator); request.signal.onabort = async () = > { await clearReadKey(readKey); }; return new Response(stream, { headers: { 'Content-Type': 'text/event - stream', 'Cache-Control': 'no - cache, no - transform', 'Connection': 'keep - alive', 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS', 'Access-Control-Allow-Headers': 'Content-Type, Authorization', }, }); } function iteratorToStream(iterator: AsyncGenerator<Uint8Array>) { return new ReadableStream({ async pull(controller) { const { value, done } = await iterator.next(); if (done) { controller.close(); } else { controller.enqueue(value); } }, }); } • Next.jsͳΒɺ RouteϋϯυϥʹδΣω ϨʔλؔΛ ReadableStreamʹม͠ ͨͷΛͯ͠Ε