K6 Loadtests throws tons of error against Hono + Bun

[webdevcody]

What version of Hono are you using?

4.5.0

What runtime/platform is your app running on?

Bun

What steps can reproduce the bug?

Make a simple bun hono server which serves a single index.html file

import { Hono } from "hono";
import { serveStatic } from "hono/bun";
const app = new Hono();
export type App = typeof app;
app.get("/", serveStatic({ path: "./static/index.html" }));
export default app;

run a k6 load test against it

import http from "k6/http";
import { check } from "k6";
import { Rate } from "k6/metrics";

export let errorRate = new Rate("errors");

export let options = {
  vus: 10,
  duration: "10s",
  thresholds: {
    errors: ["rate<0.01"], // <1% errors
    http_req_duration: ["p(99)<1000"], // 99% of requests must complete below 1s
  },
};

export default function () {
  let res = http.get("http://localhost:3000");
  check(res, {
    "status is 200": (r) => r.status === 200,
  });
  errorRate.add(res.status !== 200);
}

you'll get tons of errors

024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
WARN[0000] Request Failed                                error="Get \"http://localhost:3000\": net/http: HTTP/1.x transport connection broken: malformed HTTP response \"\""
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/24 15:08:20 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil> 
INFO[0000] 2024/07/2

I've tried this with express, I've tried with hono/node-server, I've tried this with uWebSocket. This issue seems to only happen when using bun + hono.

What is the expected behavior?

I wouldn't expect any errors when running a k6 load test

What do you see instead?

No response

Additional information

No response

[EdamAme-x]

Is there any possibility that this is a problem of Bun?

[webdevcody]

@EdamAme-x I was able to reproduce using Elysia.js as well, so it's looking more like a bun issue

[rafaell-lycan]

cc @Jarred-Sumner