TypeError: Web Socket request did not return status 101 Switching Protocols response with Web Socket

2.0/node_modules/miniflare/dist/src/index.js:8804:48)
    at Server.emit (node:events:518:28)
    at Server.emit (node:domain:488:12)
[wrangler:err] TypeError: Web Socket request did not return status 101 Switching Protocols response with Web Socket
    at #handleLoopbackUpgrade (/Users/user/Documents/Mac/Works/PersonalWorks/sitkobi/node_modules/.pnpm/[email protected]/node_modules/miniflare/dist/src/index.js:8821:9)

import { NextResponse, type NextRequest } from 'next/server'

export const runtime = 'edge'

export function GET(request: NextRequest) {
  if (request.headers.get('upgrade') !== 'websocket') {
    return new Response('Expected websocket', { status: 400 });
  }

  const [client, server] = Object.values(new WebSocketPair());

  // @ts-ignore
  server.accept();

  server.addEventListener('message', event => {
    console.log('Received message:', event.data);
    server.send('Hello from the Next.js route handler!');
  });

  server.addEventListener('close', event => {
    console.log('WebSocket closed:', event.code, event.reason);
  });

  return new Response(null, { status: 101, webSocket: client });
}