Recognised as HTTP status
HTTP 505 HTTP Version Not Supported
- 505 HTTP Version Not Supported
- Server error
- RFC 9110
HTTP 505 HTTP Version Not Supported is a server error response: the HTTP version in the request is not supported. It is defined in RFC 9110, and the server failed to fulfil an apparently valid request.
What it means
Status code505
Reason phraseHTTP Version Not Supportedadvisory only; clients must not depend on the wording
Class5xx Server error
MeaningThe HTTP version in the request is not supported
Defined inRFC 9110
Cacheable by defaultNoonly cacheable if the response says so explicitly
How clients behave
Indicates an errorYes
Whose faultThe server
Body expectedUsually
Safe to retry automaticallyNo
The 5xx class
Class meaningThe server failed to fulfil an apparently valid request
Codes in this class11
Lowest in class500
Highest in class511
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page