Failed-error-during-websocket-handshake-connection-header-is-missing May 2026

Which or server framework are you currently using to host this application?

Managed services often strip headers; ensure WebSocket support is enabled: : Enable Stickiness for polling fallbacks. Azure App Service : Toggle WebSockets on in configuration. 💻 Local Development Protocol : Ensure using ws:// or wss:// . Which or server framework are you currently using

If you are using Nginx as a reverse proxy, you must explicitly tell it to forward the Upgrade and Connection headers. By default, Nginx does not do this. Add or update your location block in your nginx.conf file: { transports: ['websocket'] }) .

: Force websocket transport: io('url', { transports: ['websocket'] }) . Which or server framework are you currently using