HTTP/5xx (Server Error)

505 HTTP Version Not Supported

The server does not support, or refuses to support, the major version of HTTP that was used in the request message.

❓ Why does this happen?

Client requested an unsupported HTTP protocol version (e.g. attempting HTTP/3 when server only supports HTTP/1.1 or HTTP/2).

Configure web server (Nginx/Cloudflare) to enable modern HTTP protocols or use standard HTTP/1.1.

What does HTTP Status 505 mean?

The server does not support, or refuses to support, the major version of HTTP that was used in the request message.

Why am I getting a 505 status code?

Client requested an unsupported HTTP protocol version (e.g. attempting HTTP/3 when server only supports HTTP/1.1 or HTTP/2).

How do I fix a 505 HTTP Version Not Supported error?

Configure web server (Nginx/Cloudflare) to enable modern HTTP protocols or use standard HTTP/1.1.