I have found very nice classification of http status codes. It helps you get an quick overview of status codes. Category Error Code 2xx: Successful 200 OK 3xx: Redirection 301 Moved permanently 302 Found, look elsewhere (Moved temporarily) 4xx: Client Errors 403 Forbidden 404 Not Found 5xx: Server Errors 500 Internal Server Error

Nginx is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server. Nginx is known for its high performance, stability, rich feature set, simple configuration, and low resource consumption. feedback