Migrating a Web Server to IIS 5.0

Migrating Custom Modules

In Apache, custom modules extend the capabilities of the Web server. With IIS 5.0, there are a number of options for extending server capabilities. There is no direct way to migrate a custom module, so it must be recreated in IIS 5.0 using one of the following approaches:

ASP with COM components or ISAPI DLLs can be written to duplicate most of the desired functionality, such as database or file system access. There are a number of built-in ASP objects to speed this task, such as FileSystemObject, which provides the methods, properties, and collections you use to access the file system.
ISAPI filters allow you to implement custom authentication and logging, as well as URL rewriting, or “munging.” For more information about using ISAPI filters to extend IIS 5.0 security, see Security in this book.

For more information about using these technologies, see the IIS 5.0 section of the SDK documentation on MSDN.