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Adding Caching Profiles <add>

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Overview

The <add> element of the <profiles> element adds an output caching profile to the collection of output caching profiles.

Compatibility

Version Notes
IIS 10.0 The <add> element was not modified in IIS 10.0.
IIS 8.5 The <add> element was not modified in IIS 8.5.
IIS 8.0 The <add> element was not modified in IIS 8.0.
IIS 7.5 The <add> element was not modified in IIS 7.5.
IIS 7.0 The <add> element of the <profiles> element was introduced in IIS 7.0.
IIS 6.0 N/A

Setup

The <add> element of the <profiles> element is included in the default installation of IIS 7.

How To

How to configure page output caching

  1. Open Internet Information Services (IIS) Manager:

    • If you are using Windows Server 2012 or Windows Server 2012 R2:

      • On the taskbar, click Server Manager, click Tools, and then click Internet Information Services (IIS) Manager.

    • If you are using Windows 8 or Windows 8.1:

      • Hold down the Windows key, press the letter X, and then click Control Panel.
      • Click Administrative Tools, and then double-click Internet Information Services (IIS) Manager.

    • If you are using Windows Server 2008 or Windows Server 2008 R2:

      • On the taskbar, click Start, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.

    • If you are using Windows Vista or Windows 7:

      • On the taskbar, click Start, and then click Control Panel.
      • Double-click Administrative Tools, and then double-click Internet Information Services (IIS) Manager.

  2. In the Connections pane, go to the connection, site, application, or directory for which you want to configure page output caching.

  3. In the Home pane, scroll to Output Caching, and then double-click Output Caching.
    Screenshot of the Home pane with the Output Caching icon being highlighted.

  4. In the Actions pane, click Add...

  5. In the Add Cache Rule dialog box, type the file name extension you want to cache in the File name extension box, and then select the User-mode caching option, the Kernel-mode caching option, or both.

  6. Select the options that you want to use for caching, and then click OK.
    Screenshot of the Add Cache Rule dialog box, showing the File name extension field.

Configuration

Attributes

Attribute Description
duration Optional timeSpan attribute.

Specifies the time (in seconds) that the page or user control is cached

The default is 00:00:30.
extension Required string attribute.

Specifies the file name extension for the files you want to cache.
kernelCachePolicy Optional enum attribute.

Configures the kernel caching policy.

The kernelCachePolicy attribute can be one of the following values. The default is DontCache.
Value Description
DontCache Content is not cached.

The numeric value is 0.
CacheUntilChange Content is only cached until the content changes.

The numeric value is 1.
CacheForTimePeriod Content is cached for the length of time specified by the duration attribute.

The numeric value is 2.
DisableCache The cache is disabled and no caching will occur.

The numeric value is 3.
location Optional enum attribute.

Specifies the valid values for controlling the location of the output-cached HTTP response for a resource.

The location attribute can be one of the following possible values. The default is Server.
Value Description
Any The output cache can be located on the browser client (where the request originated), on a proxy server (or any other server) participating in the request, or on the server where the request was processed.

The numeric value is 0.
Client The output cache is located on the browser client where the request originated.

The numeric value is 1.
Downstream The output cache can be stored in any HTTP 1.1 cache-capable devices other than the origin server. This includes proxy servers and the client that made the request.

The numeric value is 2.
Server The output cache is located on the Web server where the request was processed.

The numeric value is 3.
None The output cache is disabled for the requested page.

The numeric value is 4.
ServerAndClient The output cache can be stored only at the origin server or at the requesting client. Proxy servers are not allowed to cache the response.

The numeric value is 5.
policy Optional enum attribute.

Configures the output caching policy.

The policy attribute can be one of the following possible values. The default is DontCache.
Value Description
DontCache Content is not cached.

The numeric value is 0.
CacheUntilChange Content is only cached until the content changes.

The numeric value is 1.
CacheForTimePeriod Content is cached for the length of time specified by the duration attribute.

The numeric value is 2.
DisableCache The cache is disabled and no caching will occur.

The numeric value is 3.
varyByHeaders Optional string attribute.

Specifies a semicolon-separated list of HTTP headers used to vary the output cache. When this attribute is set to multiple headers, the output cache contains a different version of the requested document for each combination of specified headers.
varyByQueryString Optional string attribute.

Specifies a semicolon-separated list of strings used to vary the output cache. By default, these strings correspond to a query string value sent with GET method attributes, or a parameter sent by using the POST method. When this attribute is set to multiple parameters, the output cache contains a different version of the requested document for each combination of specified parameters. Possible values include none, an asterisk (*), and any valid query string or POST parameter name.

Child Elements

None.

Configuration Sample

The following configuration example enables user-mode caching and kernel-mode caching, both of which are enabled by default in IIS 7.0. It also uses the <add> element contained by the <profiles> element to enable output caching for files with the .asp file name extension. It also uses the policy attribute to output cache the page until it changes; it does the same for kernel caching using the kernelCachePolicy attribute.

<configuration>
   <system.webServer>
      <caching enabled="true" enableKernelCache="true">
         <profiles>
            <add extension=".asp" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" />
         </profiles>
      </caching>
   </system.webServer>
</configuration>

The following code example sets the maximum output cache size to 1 gigabyte and sets the maximum size of a response that can be stored in the output cache to 512 kilobytes.

<configuration>
   <system.webServer>
      <caching enabled="true" enableKernelCache="true" maxCacheSize="1000" maxResponseSize="512000"/>
   </system.webServer>
</configuration>

Sample Code

The following examples configure page output caching for files with the .asp file name extension, and configure IIS to cache in user mode and kernel mode until ASP files change.

AppCmd.exe

appcmd.exe set config -section:system.webServer/caching /+"profiles.[extension='asp',policy='CacheUntilChange',kernelCachePolicy='CacheUntilChange']" /commit:apphost

Note

You must be sure to set the commit parameter to apphost when you use AppCmd.exe to configure these settings. This commits the configuration settings to the appropriate location section in the ApplicationHost.config file.

C#

using System;
using System.Text;
using Microsoft.Web.Administration;

internal static class Sample {
   private static void Main() {
      using(ServerManager serverManager = new ServerManager()) { 
         Configuration config = serverManager.GetApplicationHostConfiguration();
         ConfigurationSection cachingSection = config.GetSection("system.webServer/caching");
         ConfigurationElementCollection profilesCollection = cachingSection.GetCollection("profiles");

         ConfigurationElement addElement = profilesCollection.CreateElement("add");
         addElement["extension"] = @"asp";
         addElement["policy"] = @"CacheUntilChange";
         addElement["kernelCachePolicy"] = @"CacheUntilChange";
         profilesCollection.AddAt(0, addElement);

         serverManager.CommitChanges();
      }
   }
}

VB.NET

Imports System
Imports System.Text
Imports Microsoft.Web.Administration

Module Sample
   Sub Main()
      Dim serverManager As ServerManager = New ServerManager
      Dim config As Configuration = serverManager.GetApplicationHostConfiguration
      Dim cachingSection As ConfigurationSection = config.GetSection("system.webServer/caching")
      Dim profilesCollection As ConfigurationElementCollection = cachingSection.GetCollection("profiles")
      Dim addElement As ConfigurationElement = profilesCollection.CreateElement("add")
      addElement("extension") = "asp"
      addElement("policy") = "CacheUntilChange"
      addElement("kernelCachePolicy") = "CacheUntilChange"
      profilesCollection.AddAt(0, addElement)
      serverManager.CommitChanges()
   End Sub
End Module

JavaScript

var adminManager = new ActiveXObject('Microsoft.ApplicationHost.WritableAdminManager');
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST";
var cachingSection = adminManager.GetAdminSection("system.webServer/caching", "MACHINE/WEBROOT/APPHOST");
var profilesCollection = cachingSection.ChildElements.Item("profiles").Collection;

var addElement = profilesCollection.CreateNewElement("add");
addElement.Properties.Item("extension").Value = "asp";
addElement.Properties.Item("policy").Value = "CacheUntilChange";
addElement.Properties.Item("kernelCachePolicy").Value = "CacheUntilChange";
profilesCollection.AddElement(addElement, 0);

adminManager.CommitChanges();

VBScript

Set adminManager = createObject("Microsoft.ApplicationHost.WritableAdminManager")
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST"
Set cachingSection = adminManager.GetAdminSection("system.webServer/caching", "MACHINE/WEBROOT/APPHOST")
Set profilesCollection = cachingSection.ChildElements.Item("profiles").Collection

Set addElement = profilesCollection.CreateNewElement("add")
addElement.Properties.Item("extension").Value = "asp"
addElement.Properties.Item("policy").Value = "CacheUntilChange"
addElement.Properties.Item("kernelCachePolicy").Value = "CacheUntilChange"
profilesCollection.AddElement addElement, 0

adminManager.CommitChanges()