What are HTTP status codes?

Status codes are messages a website's server sends to the browser or system to indicate whether or not a request has been fulfilled.
Categories of status codes:

• Informational responses (100 – 103): They are messages that alert the user to wait for a final response when the request is processing.

• Successful responses (200 – 207): This category of status codes indicates the action requested by the client was received, understood, and accepted.

• Network messages (300 – 308): These messages indicate that the requested content has been moved and will require further action to complete the request.

• Client side error responses (400 – 499): They are messages that indicate an error caused by the clients input.

• Server side error responses (500 – 599): They are messages that indicate that the server which the client is trying to access has a problem.