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fetch is hanging up, no response #17525

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@Manuelbaun

Description

What version of Bun is running?

1.2.2+c1708ea6a

What platform is your computer?

Darwin 24.3.0 arm64 arm

What steps can reproduce the bug?

Hello Developer,

my fetch method to the endpoint "https://sandbox.finapi.io/api/v2/oauth/token" does not return anything, no response, no error when Bun.serve is executed. Other methods functions work though. On windows it does work. Now, If I comment out the Bun.serve part, then and only then the fetch does response with what is expected from the endpoint.

I thing the only response I get is if idle times out.

const server = Bun.serve({
    port: 5555,
    async fetch(req) {
        return new Response("ok", {
            status: 200,
            statusText: "test",
        });
    },
});

console.log(`HTTPS Proxy running on port ${server.port}`);


const t = performance.now();
setInterval(() => console.log(new Date()), 10_000);

// does not work, no response
fetch("https://sandbox.finapi.io/api/v2/oauth/token", {
    method: "POST",
    body: "just test for now",
})
    .then((response) => response.text())
    .then((result) => console.log(result))
    .catch((error) => console.error(error))
    .finally(() => {
        console.log(performance.now() - t, "ms");
    });

// does work
fetch("https://swapi.dev/api/")
    .then((response) => response.text())
    .then((result) => console.log(result))
    .catch((error) => console.error(error));

// does work
fetch("https://echo.free.beeceptor.com")
    .then((response) => response.text())
    .then((result) => console.log(result))
    .catch((error) => console.error(error));

// does work
fetch("https://echo.free.beeceptor.com", {
    method: "POST",
})
    .then((response) => response.text())
    .then((result) => console.log(result))
    .catch((error) => console.error(error));

What is the expected behavior?

fetch request to https://sandbox.finapi.io/api/v2/oauth/token should return something

What do you see instead?

the request to https://sandbox.finapi.io/api/v2/oauth/token does not return anything and hangs until idle timeout. on windows it does not happen on mac, it does.
the other api calls are not effected and do return a response.

Additional information

Using Postman on same machine works.
If I do somthing wrong, please let me know. I already spend quite a. lot of time, try to debug,

Update:

I do get a response after 225 seconds. Its the same response I get, when I comment out bun.serve.
It seems, that the requests goes through and hangs somewhere in the http server and gets released when something timed out.

Update 2

same behavoir with bun 1.2.3-canary.138+dc5fae461

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