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chttpmodule-onupdaterequestcache-method.md

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title CHttpModule::OnUpdateRequestCache Method
ms.date 10/07/2016
description The OnUpdateRequestCache method will handle an Update Request Cache event, which occurs when IIS stores the request in the cache.
ms.assetid 2e6abd31-8a3a-00a7-424f-f79b5d97c3d2

CHttpModule::OnUpdateRequestCache Method

Represents the method that will handle an UpdateRequestCache event, which occurs when IIS stores the request in the cache.

Syntax

virtual REQUEST_NOTIFICATION_STATUS OnUpdateRequestCache(  
   IN IHttpContext* pHttpContext,  
   IN IHttpEventProvider* pProvider  
);

Parameters

pHttpContext
[IN] A pointer to an IHttpContext interface.

pProvider
[IN] A pointer to an IHttpEventProvider interface.

Return Value

A REQUEST_NOTIFICATION_STATUS value.

Remarks

When a request-level module is registered for the RQ_UPDATE_REQUEST_CACHE event notification, IIS will call the module's OnUpdateRequestCache method when IIS stores the request in the cache.

Note

Request-level modules can register for the UpdateRequestCache event notification by registering for RQ_UPDATE_REQUEST_CACHE in the module's RegisterModule function.

Example

The following code example demonstrates how to create a request-level HTTP module that registers for the RQ_UPDATE_REQUEST_CACHE event and post-event notifications. When IIS updates the cache, IIS will call the example module's OnUpdateRequestCache and OnPostUpdateRequestCache methods. Each method will write an entry in the application log of the Windows Event Viewer. When processing is complete, the module will exit.

[!code-cppCHttpModuleUpdateRequestCache#1]

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.

Requirements

Type Description
Client - IIS 7.0 on [!INCLUDEwinvista]
- IIS 7.5 on Windows 7
- IIS 8.0 on Windows 8
- IIS 10.0 on Windows 10
Server - IIS 7.0 on [!INCLUDEwinsrv2008]
- IIS 7.5 on Windows Server 2008 R2
- IIS 8.0 on Windows Server 2012
- IIS 8.5 on Windows Server 2012 R2
- IIS 10.0 on Windows Server 2016
Product - IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0
- [!INCLUDEiisexp75], [!INCLUDEiisexp80], [!INCLUDEiisexp100]
Header Httpserv.h

See Also

CHttpModule Class
CHttpModule::OnPostUpdateRequestCache Method