Unable to connect on React-Native (only in Debug Mode)

You want to:

• report a bug
• request a feature

Current behaviour

I can’t connect via socket io to my server, it times out.

Steps to reproduce (if the current behaviour is a bug)

In react-native:

import io from 'socket.io-client';


const BACKEND = 'my socketio server url'

const sock = io(BACKEND, { transports: ['websocket'], forceNew: true });
sock.on('connected', () = {
  debugger;
})

The debug logs look like:

There is nothing only a timeout triggered

Expected behaviour

I expect to be able to connect to my socketio server, the same way I am able to in a web browser.

Setup

• OS: Android 8.0
• browser: React-native
• socket.io version: 2.1.1 (but tried differents verisons with same result)

[ningacoding]

FIXED IT for me when i was adding host:port like next in debug mode:

const socket = io(“//domain.com:port”, opts); // this works only in debug mode

didn’t worked in NO debug mode, i had to add the protocol:

const socket = io(“http://domain.com:port”, opts);

[mostafiz93]

Facing the same issue. Works well when debug mode is on, but doesn’t work when Debug mode is turned off or apk is built with release mode.

Versions:
"react": "16.8.2",
"react-native": "0.58.4",
"socket.io-client": "^2.2.0"