HTTP Status Codes : 5xx Server Error

As you must be aware that HTTP calls over the internet get different responses. Most common is 404 when you are not connected to Internet of your proxy has blocked a particular host.

The first digit of the status code specifies one of five classes of response; the bare minimum for an HTTP client is that it recognizes these five classes.

1xx: Informational
2xx: Success
3xx: Redirection
4xx: Client Errors
5xx: Server Errors

Here we are going to talk about 5xx (Server Errors).

The server failed to fulfill an apparently valid request.

Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.

So if you are a tester and get 5xx http code, you need to assign the bug to Server Team :)

500 Internal Server Error

A generic error message, given when no more specific message is suitable.

501 Not Implemented

The server either does not recognize the request method, or it lacks the ability to fulfil the request.

502 Bad Gateway

The server was acting as a gateway or proxy and received an invalid response from the upstream server.

503 Service Unavailable

The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.

504 Gateway Timeout

The server was acting as a gateway or proxy and did not receive a timely request from the upstream server.

505 HTTP Version Not Supported

The server does not support the HTTP protocol version used in the request.

506 Variant Also Negotiates

507 Insufficient Storage

509 Bandwidth Limit Exceeded

510 Not Extended

Further extensions to the request are required for the server to fulfill it.