500-level errors
Server Error responses occur when there was an unexpected error that occurred while processing the document.
| Status code | Error type | Description |
|---|---|---|
| 500 | System error | The Rapid Transit POD encountered an unexpected condition that prevented it from fulfilling the request |
| 501 | Not implemented | The Rapid Transit POD does not support the functionality that is required to fulfill the request |
| 502 | Bad gateway | The Rapid Transit POD received an invalid response from the upstream server that it accessed in attempting to fulfill the request |
| 503 | Service unavailable | The request that was generated by the Rapid Transit POD was refused by the upstream server |
| 504 | Timeout | The Rapid Transit POD did not receive a timely response from the upstream server that was specified by the URI or some other auxiliary server, such as a DNS, that it needed to access in attempting to complete the request |