node.js - Socket io chat - disconnecting clients randomly ping timeout and transport close errors ver 2.2.0 - Stack Overflow
SocketIO | Midway
transport close - ping has not timeout · Issue #3191 · socketio/socket.io · GitHub
NodeJS : what is the default pingTimeout and pingInterval in socket.io - YouTube
How it works | Socket.IO
Prevent socket io from emitting ping timeout for inactive or not focused browser page in mobile browsers chrome, firefox and safari. · Issue #3507 · socketio/socket.io · GitHub