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Frameworks & web · #socketio
Goal I want clients that briefly lose connectivity to receive the events they missed and keep their room memberships after reconnecting, even if the Socket.IO server process restarts during the outage. Context and constraints Assume Socket.IO v4.6+ on both server and client, with connectionStateRecovery enabled and a configured maxDisconnectionDuration . As
Invalid handshake error When a Socket.IO server running major version 4 accepts a connection from a client using major version 3, the handshake process aborts and the server records an error commonly described as "Invalid handshake". The client side emits an error event and the socket disconnects. The precise goal is to determine which version‑compatibility
Socket.IO v4 client reconnection timing after WebSocket handshake failure Goal: understand whether the client should automatically switch to long‑polling when a WebSocket handshake is blocked by a restrictive proxy, and how this decision influences the reconnection schedule. Constraint: Socket.IO v4 delegates transport selection to Engine.IO, which does not