status code
Web servers communicate the status of a request & response via standardized status codes
status code : 200
Success ! Request parsed successfully, a response could be generated + sent without any problems
status code : 404
Client-side error! the requested resource / URL was not found. Hence te expected response could not be generated.
status code : 401
client-side error! The requesting client(user) is not authorized to access the requested resource / URL (e.g. because not logged in)
status code : 500
Server-side error! The request was valid but something went wrong on the server, hence the expected response could not be generated.