[help] Can't use it locally: `Error! Failed to complete request to /api/hello: Error: socket hang up`

[sixclones]

Hi,

I'm trying to use deno as a runtime but it seems that I'm missing something in my setup.

My project

project
|__web
    api
    |__hello.ts
    .vercel.json

hello.ts

export default () => new Response(`Hello, from Deno v${Deno.version.deno}!`);

vercel.json

{
	"version": 2,
	"functions": {
		"api/**/*.[jt]s": {"runtime": "[email protected]"}
	}
}

Vercel

I created a project in Vercel, linked it to my Git repository and defined web as my root directory. Next, inside my project I ran vercel link.

On my side

Deno v1.18.1 is installed, vercel CLI v23.1.2 is installed and NodeJS v16.13.0 is installed.

When I run vercel dev, everything's good.

> Ready! Available at http://localhost:3000

But then when I go http://localhost:3000/api/hello, I got:

502: BAD_GATEWAY
Code: NO_RESPONSE_FROM_FUNCTION
ID: dev1::dev1::tk09g-1643464806192-eb798a5b7597

and from the terminal

Error! Failed to complete request to /api/hello: Error: socket hang up

I tried on two computers (one using WSL2, one using macOS), result is the same.

The thing is that when I deploy on Vercel, the API is working: https://numbered-tech.vercel.app/api/hello.

What I'm missing?

Thanks

[rafatrace]

Same thing happening to me

[wit03]

the problem may cause by using Router from Oak. I tried to deploy both with Router implemented and without and the error only occurs on the Router implemented version.

[JiDai]

I have exactly the same problem with a similar simple example

export default async () => new Response('pong');

Did you find a solution or workaround to make it work ? I don't know how to debug or understand the error...

Deno version : 1.23.1 Vercel : 27.2.0 vercel-deno 1.1.0

[kidonng]

You can replace dev-server.ts found in the following directories with the patched one in #102:

• macOS: ~/Library/Caches/com.vercel.cli/dev/builders/node_modules/vercel-deno
• Windows: %APPDATA%\Roaming\npm\node_modules\vercel\node_modules\vercel-deno

Note these are not exact location (and I may be wrong).