View Image

IIS Mod-Rewrite is a powerful, high quality professional URL rewriting tool for IIS. It rewrites URLs on the fly by using flexible custom rules and helps web developers and webmasters get the most out of their web applications. It is ideal for Search Engine Optimization (SEO), redirecting or proxying requests, blocking undesired traffic and much more.

IIS Mod-Rewrite installs like breeze on your server and you can configure its numerous features through an easy-to-use, yet powerful control center.

How it works

The URL manipulation mechanism of IIS Mod-Rewrite is rule based. When a requested URL matches a rule, a specified text substitution is performed on that URL.

Every rule is based on a regular expression. When a rule is executed, first the regex is tested on the input URL. If a match occurs, then IIS Mod-Rewrite proceeds with the substitution of the URL. The substitution text consists of a combination of static and dynamic text strings. The inserted dynamic strings can be substrings of the matched URL (backreferences), server variables, or mapped values through lookup tables. This basic mechanism can be applied for a sequence of rules. The first rule take as input the URL passed by the webserver, and each next rule takes as input the output URL of the previously matched rule.

Furthermore, a matched rule may be subject of additional conditions. If those conditions are met, then the URL substitution is applied. For more about rules, conditions, regular expressions, and text substitution, see RewriteRule and RewriteCond directives.