ASP.NET 4 Unleashed

Creating Custom HTTP Modules

An HTTP Module is a .NET class that executes with each and every page request. You can use an HTTP Module to handle any of the HttpApplication events that you can handle in the Global.asax file.

Behind the scenes, ASP.NET Framework uses HTTP Modules to implement many of the standard features of the framework. For example, ASP.NET Framework uses the FormsAuthenticationModule to implement Forms authentication and the WindowsAuthenticationModule to implement Windows authentication.

Session state is implemented with an HTTP Module named the SessionStateModule. Page output caching is implemented with an HTTP Module named the OutputCacheModule, and the Profile object is implemented with an HTTP Module named the ProfileModule ...