4xx and 5xx Error Codes
This appendix provides the list of 4xx and 5xx error codes.
4xx: Client Error
| Message | Description |
|---|---|
| 400 Bad Request | The server did not understand the request. |
| 403 Forbidden | Access is forbidden to the requested page. |
| 404 Not Found | The server can not find the requested page. |
| 405 Method Not Allowed | The method specified in the request is not allowed. |
| 409 Conflict | The request could not be completed because of a conflict. |
| 415 Unsupported Media Type | The server will not accept the request, because the mediatype is not supported. |
5xx: Server Error
| Message | Description |
|---|---|
| 500 Internal Server Error | The request was not completed. The server met an unexpected condition. |
| 501 Not Implemented | The request was not completed. The server did not support the functionality required. |
| 502 Bad Gateway | The request was not completed. The server received an invalid response from the upstream server. |
| 503 Service Unavailable | The request was not completed. The server is temporarily overloading or down. |
| 504 Gateway Timeout | The gateway has timed out. |
| 505 HTTP Version Not Supported | The server does not support the "http protocol" version. |
