title	IHttpCachePolicy2::SetForceUpdate Method
description	Describes the IHttpCachePolicy2::SetForceUpdate method and provides the method's syntax, parameters, remarks, and requirements.
ms.date	10/07/2016
ms.assetid	21f01a8a-79fb-4fc5-8e53-3f80664c8686

IHttpCachePolicy2::SetForceUpdate Method

Sets a value that indicates that the cache should be updated for a specific request or request variation

Syntax

virtual VOID SetForceUpdate(  
   VOID  
) = 0;

This method takes no parameters.

Certain modules need the ability to evaluate requests and update the cache based on variations of the request. The SetForceUpdate method ensures that the cache is updated. A module may keep track of the criteria needed to update the module cache and call this method. Additionally, modules may call IHttpCachePolicy2::IsForceUpdateSet Method to determine if the value has been set.
CHttpModule derived classes that register for request or response events receive an IHttpContext pointer as a parameter on the corresponding virtual method. To enable caching, call the IHttpContext::GetResponse method, the IHttpResponse::GetCachePolicy method, and finally the IHttpCachePolicy::SetIsCached Method method.

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