The HyperText Transfer Protocol (HTTP) 505 HTTP Version Not Supported response status code indicates that the HTTP version used in the request is not supported by the server.
505 HTTP Version Not Supported
| Specification | Title |
|---|---|
| RFC 7231, section 6.6.6: 505 HTTP Version Not Supported | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/505