Most of us come across the internet errors, during browsing and trying to open the web pages and then we are directed to the other page showing it has Google error page with some error codes, so here in this post I've just tried to explain you what that codes actually means and where the problem is exactly.
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/unknown host
Error 500-599 - Server Errors.
Now i guess next time when you are getting this errors you'll get to know what's wrong while the web page you are searching for.