how to synchronously send a response and then continue?

[huseeiin]

i can't do this:

addEventListener("fetch", async (e) => {
  e.respondWith(Response.json({}));

  await new Promise((r) => setTimeout(r, 5000));
  console.log("timeout");
});

meanwhile i can do this in node:

import { createServer } from "http";

createServer(async (req, res) => {
  res.end("Hello");

  await new Promise((r) => setTimeout(r, 5000));
  console.log("timeout");
});

[kentonv]

You need to use waitUntil() to tell the runtime about tasks that you want to keep running after the response is returned, otherwise the runtime automatically cancels everything when the event is "done".

https://developers.cloudflare.com/workers/runtime-apis/context/#waituntil

export default {
  async fetch(req, env, ctx) {
    ctx.waitUntil(logLater());
    return Respnose.json({});
  }
}

async function logLater() {
  await scheduler.wait(5000);
  console.log("timeout");
}