---
title: 505 HTTP Version Not Supported
slug: Web/HTTP/Status/505
tags:
  - HTTP
  - Reference
  - Server error
  - Status code
---
{{HTTPSidebar}}

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.

## Status

```
505 HTTP Version Not Supported
```

## Specifications

| Specification                                                                    | Title                                                         |
| -------------------------------------------------------------------------------- | ------------------------------------------------------------- |
| {{RFC("7231", "505 HTTP Version Not Supported" , "6.6.6")}} | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |

## See also

- {{HTTPHeader("Upgrade")}}
