Should the access modifier of the httpServer object be set to private?

[zicjin]

I have been trying to handle port conflicts when starting the socket.io server, so that I can attempt to use the next available port if the current one is already in use. However, due to the inability to access the httpServer property, I am unable to monitor the EADDRINUSE event and take appropriate action.

Am I missing other ways to catch EADDRINUSE error in Standalone mode?

https://github.com/socketio/socket.io/blob/main/lib/index.ts#L205

  io = new Server(port, { serveClient: false })
  // @ts-expect-error
  io.httpServer.on('error', (error: NodeJS.ErrnoException) => {
    if (error.code === 'EADDRINUSE') {
      console.log(`Port ${port} is already in use`);
      socketStart(port + 1);
    } else {
      console.error('An error occurred:', error);
    }
  });

[darrachequesne]

Hi! I think you should provide your own HTTP server:

import { createServer } from "node:http";
import { Server } from "socket.io";

const httpServer = createServer();
const io = new Server(httpServer, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

httpServer.on("error", () => {
  // ...
});

httpServer.listen(3000);

Reference: https://socket.io/docs/v4/server-initialization/#with-an-http-server