This are response codes in web API
1xx: Informational – Communicates transfer protocol-level information.
2xx: Success – Indicates that the client’s request was accepted successfully.
3xx: Redirection – This means request is not complete. The client must take some additional action in order to complete their request.
4xx: Client Error – This means there is some error in API code.
5xx: Server Error – This means the error is not due to web api code but due to some environment settings.
204 No Content: The request was successful, but the server has no data to return in the response body.
400 Bad Request: The client's request was invalid or could not be understood by the server.
401 Unauthorized: The client is not authorized to access the requested resource. The client should include authentication credentials in the request header to authenticate itself.
403 Forbidden: The client is authenticated, but not authorized to access the requested resource.
404 Not Found: The requested resource could not be found on the server.
500 Internal Server Error: An error occurred on the server while processing the request.
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Web API Advance