505
HTTP 505 HTTP Version Not Supported
5xx Server Error
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5xx Server Error
RFC 7231, Section 6.6.6
What is HTTP 505 HTTP Version Not Supported?
The 505 (HTTP Version Not Supported) status code indicates that the server does not support, or refuses to support, the major version of HTTP that was used in the request. This is rare in practice, as most servers support HTTP/1.0, HTTP/1.1, and HTTP/2.
Common Use Cases
- Legacy servers receiving unknown HTTP versions
- Restricted protocol version policies