400: Bad Request

This is a very common browser errors, this error means that you have mistyped a URL address or that you don’t have a valid permission to access the page you’re visiting. URL are sometimes case sensitive so make sure there isn’t any typo.

401: Unauthorized

This error means the page you are trying to access doesn’t permit you because you either don’t have the right password or its a restricted website for certain visitor only.

403: Forbidden

The error means you’re trying to visit a website that you don’t have any access to view. It is restricted for viewing purpose.

404: Not Found

This error shows that a website you’re trying to view may not exist anymore. The page could have been removed or renamed to something else. Besides that, it may due to networking error in your computer.

Popularity: 2%