Technology · Reference dataset
HTTP Status Codes
HTTP response status codes, grouped by category, with names and explanations.
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The 10 most recently added of 58 records · Select a column heading to sort.
| ID | Code | Name | Category | Description |
|---|---|---|---|---|
| 49 | 501 | Not Implemented | Server Error | The request method is not supported by the server. |
| 50 | 502 | Bad Gateway | Server Error | The server got an invalid response from an upstream server. |
| 51 | 503 | Service Unavailable | Server Error | The server is not ready to handle the request. |
| 52 | 504 | Gateway Timeout | Server Error | The upstream server did not respond in time. |
| 53 | 505 | HTTP Version Not Supported | Server Error | The HTTP version is not supported. |
| 54 | 506 | Variant Also Negotiates | Server Error | Internal configuration error in content negotiation. |
| 55 | 507 | Insufficient Storage | Server Error | The server cannot store the representation (WebDAV). |
| 56 | 508 | Loop Detected | Server Error | An infinite loop was detected (WebDAV). |
| 57 | 510 | Not Extended | Server Error | Further extensions are required to fulfill the request. |
| 58 | 511 | Network Authentication Required | Server Error | The client needs to authenticate to gain network access. |
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Scope and sources
Last checked against sources: October 15, 2026.
Last changed: October 15, 2026. This is when we last changed the data or its description. It doesn’t mean the data runs up to that date.
- Internet Assigned Numbers Authority (IANA) (used with permission)
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