WebSocket connection succeeds but Elysia WebSocket handler is not triggered when running inside Nitro

[kangkangovo12138]

Environment

node

Reproduction

I am using Elysia as a handler inside Nitro. I enabled WebSocket support in Elysia and the WebSocket connection can be established successfully, but the Elysia WebSocket handler is never executed.

Environment

• Nitro version:
• Elysia version:
• Runtime: Bun
• OS:

Reproduction

Elysia app:

import { Elysia } from 'elysia'
import { websocket } from 'elysia/websocket'

export const app = new Elysia()
  .use(websocket())
  .ws('/ws', function* () {
    console.log('handler entered')

    yield 1
    yield 2
    yield 3
  })

Nitro config:

export default defineNitroConfig({
  features: {
    websocket: true
  }
})

Client:

const ws = new WebSocket('ws://localhost:3000/ws')

ws.onopen = () => {
  console.log('connected')
}

ws.onmessage = (event) => {
  console.log(event.data)
}

Expected behavior

After the WebSocket connection is established, the Elysia WebSocket handler should be executed:

connected
handler entered
1
2
3

Actual behavior

The WebSocket handshake succeeds:

WebSocket connection established

but the Elysia handler is never entered:

(no console output)

No error is thrown.

Describe the bug

none

Additional context

No response

Logs