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5xx Server Error
11 status codes
These codes indicate that the server failed to fulfill a valid request. The error is on the server side — the server encountered an unexpected condition that prevented it from fulfilling the request.
| Code | Title | Description | RFC |
|---|---|---|---|
| 500 | Internal Server Error | The server encountered an unexpected condition that prevented it from fulfilling the request. | RFC 7231, Section 6.6.1 |
| 501 | Not Implemented | The server does not support the functionality required to fulfill the request. | RFC 7231, Section 6.6.2 |
| 502 | Bad Gateway | The server, while acting as a gateway or proxy, received an invalid response from an inbound server. | RFC 7231, Section 6.6.3 |
| 503 | Service Unavailable | The server is currently unable to handle the request due to a temporary overload or scheduled maintenance. | RFC 7231, Section 6.6.4 |
| 504 | Gateway Timeout | The server, while acting as a gateway or proxy, did not receive a timely response from an upstream server. | RFC 7231, Section 6.6.5 |
| 505 | HTTP Version Not Supported | The server does not support, or refuses to support, the major version of HTTP that was used in the request. | RFC 7231, Section 6.6.6 |
| 506 | Variant Also Negotiates | The server has an internal configuration error: the chosen variant resource is configured to engage in transparent content negotiation itself. | RFC 2295, Section 8.1 |
| 507 | Insufficient Storage | The method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request. | RFC 4918, Section 11.5 |
| 508 | Loop Detected | The server terminated an operation because it encountered an infinite loop while processing a request (WebDAV). | RFC 5842, Section 7.2 |
| 510 | Not Extended | The policy for accessing the resource has not been met in the request. | RFC 2774, Section 7 |
| 511 | Network Authentication Required | The client needs to authenticate to gain network access. | RFC 6585, Section 6 |
Last updated: 21 Jun 2026
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