Apache

A beginner's guide to URL rewriting, with plenty of examples.

The second version of the mod_rewrite Cheat Sheet, a quick reference guide for mod_rewrite, with rewrite flags, regular expression syntax and sample rules.

Referrer spam is becoming increasingly common. At best, it will only render your log files useless. At worst, it can cause your site to be dropped by search engines and your running costs to skyrocket. Here's how to block spurious referrers.

A tutorial explaining how to retrict access to a directory on a web server using .htaccess.

All valid HTTP 1.1 Status Codes simply explained.

Apache allows you to customize the server at the directory level, using .htaccess files. This tutorial explains how to use them to serve custom 404 error (page not found), and other common error pages, to your users.