HTTP 505 HTTP Version Not Supported

What 505 means

Rare with modern clients; usually a misconfigured client or proxy.

Common causes

• A client using an outdated or unsupported HTTP version.

How to fix it

1. Update the client or proxy to use HTTP/1.1 or HTTP/2.

How to check a status code

Enter a URL in the HTTP Status Checker to see its status code, every redirect hop, and response time. For redirect-heavy pages, the Website Speed Test shows how much time redirects add.

FAQ

What does HTTP 505 mean?

505 HTTP Version Not Supported is a 5xx server error status code. The server does not support the HTTP version used in the request.

What causes a 505 error?

A client using an outdated or unsupported HTTP version.

How do I fix HTTP 505?

Update the client or proxy to use HTTP/1.1 or HTTP/2.