HcCacheControlHeader

The HcCacheControlHeader property specifies the directive that IIS adds to the Cache-Control header. This header, along with the Expires header specified by HcExpiresHeader, is included with every compressed file that is sent to a client browser.

The HcCacheControlHeader property specifies a header that overrides the HTTP Expires header, which is specified by HcExpiresHeader, and is included to ensure that older clients and proxy servers do not attempt to cache compressed files.

Neither the header specified by HcCacheControlHeader nor the header specified by HcExpiresHeader is sent with a response if the metabase property HcSendCacheHeaders is set to false.

The World Wide Web Publishing Service (WWW service) must be restarted before changes to this property take effect.

Schema Attributes

Attribute Name	Value
ADSI/WMI Data Type	STRING
ABO Data Type	STRING_METADATA
Schema Default	max-age=86400
Internal Default	maxage=86400
Upper Bound	Not specified
Lower Bound	Not specified
Internal ID	2211
Friendly ID	MD_HC_CACHE_CONTROL_HEADER
Property Attributes	NO_ATTRIBUTES
User Type	IIS_MD_UT_SERVER

Configurable Locations

You can configure this property at the following locations in the IIS metabase.

Metabase Path	IIS Admin Object Type
/LM/W3SVC/Filters/Compression/Parameters	IIsCompressionSchemes

Flags

There are no flags for this property.

Requirements

Client: Requires Windows XP Professional, Windows 2000 Professional, or Windows NT Workstation 4.0.

Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.

Product: IIS

See Also