In order to ease the migration to Socket.IO v3, the v3 server is now able to communicate with v2 clients:
const io = require("socket.io")({
allowEIO3: true // false by default
});Note: the allowEIO3 refers to the version 3 of the Engine.IO protocol which is used in Socket.IO v2
Features
- confirm a weak but matching ETag (#3485) (161091d)
- esm: export the Namespace and Socket class (#3699) (233650c)
- add support for Socket.IO v2 clients (9925746)
- add room events (155fa63)
Bug Fixes
- allow integers as event names (1c220dd)
Links:
- Diff: 3.0.5...3.1.0
- Client release: 3.1.0
- engine.io version:
~4.1.0 - ws version:
~7.4.2