Configuring Request Filters (IIS 7)
Applies To: Windows 7, Windows Server 2008, Windows Server 2008 R2, Windows Vista
Request filters restrict the types of HTTP requests that IIS 7 will process. By blocking specific HTTP requests, request filters help prevent potentially harmful requests from reaching the server.
For information about the levels at which you can perform this procedure, and the modules, handlers, and permissions that are required to perform this procedure, see Request Filters Feature Requirements (IIS 7).