Successful 2xx:

200 HTTP_OK                    
201 HTTP_CREATED               
202 HTTP_ACCEPTED              
204 HTTP_NO_CONTENT           

Redirection 3xx:

300 HTTP_MOVED_PERMANENTLY     
301 HTTP_MOVED_TEMPORARILY     
302 HTTP_SEE_OTHER             
304 HTTP_NOT_MODIFIED          

Client Error 4xx:

400 HTTP_BAD_REQUEST           
401 HTTP_UNAUTHORIZED          
403 HTTP_FORBIDDEN             
404 HTTP_NOT_FOUND             

Server Error 5xx:

500 HTTP_INTERNAL_SERVER_ERROR 
501 HTTP_NOT_IMPLEMENTED       
502 HTTP_BAD_GATEWAY           
503 HTTP_SERVICE_UNAVAILABLE