Websocket example doesn't work

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[ ] Regression 
[ ] Bug report
[ ] Feature request
[x] Documentation issue or request
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Current behavior

Websocket example doesn’t work

Minimal reproduction of the problem with instructions

I cloned master, installed example 02 dependencies and ran it. When I open ws.html, it says WebSocket connection to 'ws://localhost:81/' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED. Looking at the code, the port should be the default (3000), not 81. If I change it to localhost:3000 it still doesn’t work but the error is now ws.html:4 WebSocket connection to 'ws://localhost:3000/' failed: Connection closed before receiving a handshake response

Environment

Nest version: 4.5.8 (master)

 
For Tooling issues:
- Node version: 6.11.1  
- Platform:  MacOS 10.12.6 

Others:

[yoiang]

As mentioned by @kamilmysliwiec this fixed it for me:

import { NestFactory } from '@nestjs/core'
import { WsAdapter } from '@nestjs/platform-ws' // <---
import { AppModule } from './app.module'

async function bootstrap() {
  const app = await NestFactory.create(AppModule)
  app.useWebSocketAdapter(new WsAdapter(app)) // <---
  await app.listen(3000)
}
bootstrap()

I did not find it necessary to specify a unique port in the WebSocket Gateway definition

[kamilmysliwiec]

To use ws.html you need to set up a ws adapter (it’ll force Nest to use ws instead of socket.io). Full path /src/common/adapters/ws-adapter.ts, tutorial https://docs.nestjs.com/websockets/adapter