Bun does not emit `ServerResponse "close"` event on client disconnect during active HTTP response

[kevgeoleo]

What version of Bun is running?

1.3.11-canary.1+9e93bfa1b

What platform is your computer?

Linux 5.10.0-12-amd64 x86_64 x86_64

What steps can reproduce the bug?

Hi,

I would like to report a behavior in Bun that can be reproduced using the below snippet:

import http from "node:http";
import net from "node:net";

const server = http.createServer((req, res) => {
  let closed = false;

  res.on("close", () => {
    closed = true;
    console.log("res close fired");
  });

  res.write("hello\n");

  req.on("error", () => {
    server.close(() => {
      console.log("server closed, res closed =", closed);
    });
  });
});

server.listen(3000, () => {
  const client = net.createConnection({ port: 3000 }, () => {
    client.write(
      "GET / HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n"
    );

    client.on("data", () => {
      client.end(); // force abort
    });
  });
});

What is the expected behavior?

Node.js and Deno both emit ServerResponse "close" when the client disconnects during an active response:

root@KContainer:~/24324# fuser -k 3000/tcp || true && node a.mjs
res close fired
server closed, res closed = true
root@KContainer:~/24324# fuser -k 3000/tcp || true && deno run -A a.mjs
res close fired
server closed, res closed = true

What do you see instead?

The res.on("close") event is not emitted when the client disconnects during an active HTTP response.

root@KContainer:~/24324# fuser -k 3000/tcp || true && bun run a.mjs
server closed, res closed = false

Additional information

No response

[robobun]

✅ Reproduced — res.on("close") never fires when the client aborts mid-response. Fix in #29220.

[github-actions]

Found 3 possible duplicate issues:

1. node:http ServerResponse doesn't emit close event #14697
2. Express: req/res/socket 'close' events never fire on client abort for POST requests with a body #28976
3. SSE has been waiting #16562

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