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

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:// .

: Force websocket transport: io('url', { transports: ['websocket'] }) . By default, Nginx does not do this

Which or server framework are you currently using to host this application? : Force websocket transport: io('url'

Here are the most common solutions based on your infrastructure: 🚀 Nginx Configuration Fix Managed services often strip headers

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:

Ensure mod_proxy and mod_proxy_wstunnel are enabled. Use a RewriteRule in your VirtualHost to pass WebSocket traffic:

: Force websocket transport: io('url', { transports: ['websocket'] }) .

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

Here are the most common solutions based on your infrastructure: 🚀 Nginx Configuration Fix

Ensure mod_proxy and mod_proxy_wstunnel are enabled. Use a RewriteRule in your VirtualHost to pass WebSocket traffic: