Internet Error Codes (Most Useful)

Some Internert 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 Look up Fail/ unknown host
* Error 500-599 - Server Errors.