Reference
HTTP Status Reference
A comprehensive guide to standard HTTP response codes handled by this application.
400
Bad Request
The server cannot process the request due to client error.
401
Unauthorized
Authentication is required and has failed or has not been provided.
403
Forbidden
The server understood the request but refuses to authorize it.
404
Not Found
The requested resource could not be found but may be available in the future.
500
Internal Server Error
A generic error message, given when an unexpected condition was encountered.
502
Bad Gateway
The server while acting as a gateway received an invalid response from the upstream server.
503
Service Unavailable
The server is currently unavailable (because it is overloaded or down for maintenance).