Ionic's ISAPI Rewriting Filter 2

Ionic's ISAPI Rewriting Filter 2 is the right choice if you want to specify rewrite rules using regular expressions. It has mod_rewrite; now IIS has a small, cheap (free) rewriting module Ionic's ISAPI Rewriting Filter (IIRF). ASP.NET has a URL mapping mechanism, but it works only for filetypes that are handled by ASP.NET: aspx, ascx, asmx, and so on. For static files or non-ASP.NET files, (XML, GIF, JPEG, CSS), the ASP.NET mapping won't work cleanly. IIS, like Apache's HTTP server, has an extension mechanism: it is called the ISAPI filter. There are commercial ISAPI filters that endow IIS with the ability to re-write URLs. This is a cheap and powerful alternative.

Enhancements

• Use on large-scale servers with many multiple Web sites
• Install the ISAPI filter once
• Configure each Web site or Web application independently.