CHttpModule::OnCustomRequestNotification Method

IIS 7.0

Represents the method that will handle a custom event, which occurs when a module raises a user-defined notification.

virtual REQUEST_NOTIFICATION_STATUS OnCustomRequestNotification(
   IN IHttpContext* pHttpContext,
   IN ICustomNotificationProvider* pProvider


[IN] A pointer to an IHttpContext interface.


[IN] A pointer to an ICustomNotificationProvider interface.

When a request-level module is registered for the RQ_CUSTOM_NOTIFICATION notification, IIS will call the module's OnCustomRequestNotification method when a custom notification is raised.


Request-level modules can register for a custom event notification by registering for RQ_CUSTOM_NOTIFICATION in the module's RegisterModule function.


The following code example demonstrates how to create an HTTP module that does the following:

  1. Registers for the RQ_BEGIN_REQUEST and RQ_CUSTOM_NOTIFICATION notifications.

  2. Creates a CHttpModule class that contains OnBeginRequest and OnCustomRequestNotification methods.

    • OnBeginRequest writes an event to the Event Viewer that specifies the current notification. The method then creates an instance of an ICustomNotificationProvider interface and raises the custom notification by using the IHttpContext::NotifyCustomNotification method.

    • OnCustomRequestNotification uses the ICustomNotificationProvider::QueryNotificationType method to retrieve the unique identifier for the custom notification. If the unique identifier matches, OnCustomRequestNotification writes an event to the Event Viewer that specifies the custom notification.

  3. Removes the CHttpModule class from memory and then exits.

Your module must export the RegisterModule function. You can export this function by creating a module definition (.def) file for your project, or you can compile the module by using the /EXPORT:RegisterModule switch. For more information, see Walkthrough: Creating a Request-Level HTTP Module By Using Native Code.

You can optionally compile the code by using the __stdcall (/Gz) calling convention instead of explicitly declaring the calling convention for each function.





  • IIS 7.0 on Windows Vista

  • IIS 7.5 on Windows 7

  • IIS 8.0 on Windows 8

  • IIS 10.0 on Windows 10


  • IIS 7.0 on Windows Server 2008

  • IIS 7.5 on Windows Server 2008 R2

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  • IIS 10.0 on Windows Server 2016 Technical Preview


  • IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0

  • IIS Express 7.5, IIS Express 8.0, IIS Express 10.0