http://racksburg.com/choosing-an-http-status-code/
http://gradzinski.com/articles/wybor-odpowiedniego-kodu-odpowiedzi-http-przestan-utrudniac-sobie-zycie.html
httpstatuses.com is an easy to reference database of HTTP Status Codes with their definitions and helpful code references all in one place. Visit an individual status code via httpstatuses.com/code or browse the list below