[Bug] Proxy can't support WebSocket and make umi crashed

[ZenkieBear]

What happens?

When I configured the proxy with an ws option, and send the WebSocket request to devServer, the devServer crashed:

events.js:377
      throw er; // Unhandled 'error' event
      ^

Error: read ECONNRESET
    at TCP.onStreamRead (internal/stream_base_commons.js:209:20)
Emitted 'error' event on Socket instance at:
    at Socket.onerror (internal/streams/readable.js:750:14)
    at Socket.emit (events.js:400:28)
    at emitErrorNT (internal/streams/destroy.js:106:8)
    at emitErrorCloseNT (internal/streams/destroy.js:74:3)
    at processTicksAndRejections (internal/process/task_queues.js:82:21) {
  errno: -54,
  code: 'ECONNRESET',
  syscall: 'read'
}

Mini Showcase Repository(REQUIRED)

https://github.com/ZenkieBear/umi-proxy-ws-crashing

How To Reproduce

1. Install the NPM dependencies and start the dev server.

npm i
npm start

2. Make a WebSocket request to dev server.

• You can use a api-tool to send the request, such like Postman. The url should be: ws://localhost:8000/ws/api/v1/test
• Or just visit the home page: http://localhost:8000, then you will see the crashing information in the terminal.

Context

• Umi Version: 3.5.41
• Node Version: 14.21.3
• Platform: macOS Sonoma 14.4.1

[ZenkieBear]

If you remove the /ws proxy, everything works right.

[fz6m]

umi 3 不维护了，建议升级到 umi 4 。