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#websocket-upgrade

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Guide138.8K views664 votes0 replies1,376 following

Diagnosing Socket.IO WebSocket Upgrade Failures and Long-Polling Fallback

Clients stuck on Socket.IO long-polling? Confirm the transport, isolate proxy or server causes, and apply the matching fix.

socket-io reverse-proxy websocket-upgradeTasadduq Burneyowner34.3K rep · 26 May 2026, 03:07 UTC