web serever/ internet error codes..

DIFFERENT TYPES OF INTERNET ERROR CODES !!
 Error 400 - Bad request.
 Error 401 - unauthorized request.
 Error 403 - forbidden.
 Error 404 - Not found.
 Error 500 -Internal error.
 Error 501 - Not Implemented
 Error 502 - Bad Gateway
 Error 503 -Service unavailable.
 Error 504 - Gateway Time-Out
 Error 505 - HTTP Version not supported/DNS Lookup Fail/ unknw host
 Error 500-599 - Server Errors