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HttpExpires

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The HttpExpires property specifies the expiration of HTML document content by returning the value to the browser in the HTML file header. The browser compares the given value with the current date to determine whether to display a cached page or to request an updated page from the server. This property can be made relative, or dynamic, by using the format D, #SecondsUntilExpiration, with 0xFFFFFFFF indicating no expiration date. It can also be absolute, with the format S, ValidGMTstring.

Schema Attributes

Attribute Name

Value

ADSI/WMI Data Type

STRING

ABO Data Type

STRING_METADATA

Schema Default

D, 0x15180

Internal Default

Not specified.

Upper Bound

Not specified

Lower Bound

Not specified

Internal ID

6002

Friendly ID

MD_HTTP_EXPIRES

Property Attributes

INHERIT

User Type

IIS_MD_UT_FILE

Configurable Locations

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

Metabase Path

IIS Admin Object Type

/LM/W3SVC

IIsWebService

/LM/W3SVC/n

IIsWebServer

/LM/W3SVC/n/ROOT/file_name

/LM/W3SVC/n/ROOT/virtual_directory_name/file_name

IIsWebFile

/LM/W3SVC/n/ROOT/physical_directory_name

/LM/W3SVC/n/virtual_directory_name/physical_directory_name

IIsWebDirectory

/LM/W3SVC/n/ROOT

/LM/W3SVC/n/ROOT/virtual_directory_name

IIsWebVirtualDir

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