4.1.0

Blog post: https://socket.io/blog/socket-io-4-1-0/

Features

• add support for inter-server communication (93cce05)
• notify upon namespace creation (499c892)
• add a "connection_error" event (7096e98, from engine.io)
• add the "initial_headers" and "headers" events (2527543, from engine.io)

Links:

• Diff: 4.0.2...4.1.0
• Client release: 4.1.0
• engine.io version: ~5.1.0
• ws version: ~7.4.2