Some of the most common HTTP response codes are listed below:
200 OK – Request was Successful.
201 Created – Request was successful and a resource was created. Used to confirm PUT or POST request.
400 Bad Request – The request was malformed. 400 bad request error happens because of POST and PUT requests, when data is in the wrong format or does not pass validation.
404 Not Found – Required resource could not be found. no corresponding resource URL.
401 Unauthorized – Authentication required before accessing the resource.
405 Method Not Allowed – Not supported HTTP method for this resource.
409 Conflict – Create the same resource twice by using PUT request.
500 Internal Server Error – Processing fails due to unanticipated circumstances on the server side (Server Error Out)
450 HTTP – Windows Blocked page because of Parental Controls.