Common HTTP response codes
| Code | Name | Meaning |
|---|---|---|
| 200 | OK | Request has succeeded |
| 201 | Created | Resource created |
| 204 | No Content | Success, no content returned |
| 301 | Moved Permanently | Permanent redirect |
| 302 | Found | Temporary redirect |
| 304 | Not Modified | Use browser cache |
| 400 | Bad Request | Invalid request |
| 401 | Unauthorized | No/invalid auth |
| 403 | Forbidden | Insufficient permissions |
| 404 | Not Found | Resource missing |
| 409 | Conflict | Edit conflict |
| 415 | Unsupported Media | Wrong type |
| 429 | Too Many Requests | Rate limited |
| 500 | Internal Error | Server crashed |
| 502 | Bad Gateway | Invalid upstream |
| 503 | Unavailable | Service overloaded |
| 504 | Gateway Timeout | Upstream timeout |