Choosing Socket.io Transports: WebSocket vs. HTTP Long-Polling
A technical guide on choosing between WebSocket and HTTP long-polling in Socket.io, focusing on the trade-offs between network compatibility and server performance.
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Diagnosing Socket.io Transport Fallbacks: Moving from Polling to WebSockets
Learn how to diagnose and fix Socket.io connection issues where clients fall back to HTTP long-polling instead of using WebSockets, including Nginx and load balancer configurations.
nginxDiagnosing Socket.io Transport Failures: When WebSockets Fail to Upgrade
Learn how to diagnose and fix Socket.io connection issues where clients stay stuck in HTTP polling mode instead of upgrading to WebSockets, including proxy configurations and CORS fixes.
"Session ID unknown" (HTTP 400) during rolling deploys: sticky sessions vs Redis adapter for Socket.IO
I'm planning a zero-downtime migration of a small Socket.IO application to a multi-node setup behind a load balancer. During rolling restarts, clients using the default transports can hit the Engine.IO error Session ID unknown (HTTP 400), because the handshake session lives in memory on the node that issued it and a subsequent polling request may land on a d