2.1.0

Features

• add a 'binary' flag (#3185)

// by default, the object is recursively scanned to check whether it contains some binary data
// in the following example, the check is skipped in order to improve performance
socket.binary(false).emit('plain-object', object);

// it also works at the namespace level
io.binary(false).emit('plain-object', object);

• add support for dynamic namespaces (#3195)

io.of(/^\/dynamic-\d+$/).on('connect', (socket) => {
  // socket.nsp.name = '/dynamic-101'
});

// client-side
const client = require('socket.io-client')('/dynamic-101');

Bug fixes

• properly emit 'connect' when using a custom namespace (#3197)
• include the protocol in the origins check (#3198)

Important note ⚠️ from Engine.IO 3.2.0 release

There are two non-breaking changes that are somehow quite important:

• ws was reverted as the default wsEngine (socketio/engine.io#550), as there was several blocking issues with uws. You can still use uws by running npm install uws --save in your project and using the wsEngine option:

var engine = require('engine.io');
var server = engine.listen(3000, {
  wsEngine: 'uws'
});

• pingTimeout now defaults to 5 seconds (instead of 60 seconds): socketio/engine.io#551

Links:

• Milestone: 2.1.0
• Diff: 2.0.4...2.1.0
• Client release: 2.1.0
• engine.io version: ~3.2.0 (diff: socketio/engine.io@3.1.0...3.2.0)
• ws version: ~3.3.1 (diff: websockets/ws@2.3.1...3.3.1)