In order to have a better understanding of HTTP codes, it pays to know their classifications. From 1 up to 5, each category has their own meaning. An HTTP code starting with 1, 2, or 3 pertains to a granted request of access, or a fully functional request.Those that begin with the number 4 means that an error occurred on the client’s side. Most HTTP errors in this category include 400, 401, 403, and 404.Lastly, HTTP error codes with 5 as the first digit means an error on the server’s side. They come in the greatest numbers, spanning from 500 to 510.