Use the Set Common HTTP Response Headers dialog box to configure headers that enable HTTP keep-alive and specify when to expire Web content.

UI Element List

Element Name Description

Enable HTTP keep-alive

Select this option to keep a client/server connection open across multiple requests to the server. An open connection improves performance when a client makes multiple requests for Web page content because the server can more quickly return the content for each request.


You must use HTTP keep-alive when you use integrated security or connection-based authentication services such as Integrated Windows authentication.

Expire Web content

Select this option to configure the expiration of Web content. A Web server returns this header value to a client browser in an HTML file header. The browser compares that value with the current date to determine whether to display a page that is cached on the client computer or to request an updated page from the server.

Then select one of the following options to specify when to expire the content:

  • Immediately - expires the content immediately after it is delivered. This setting is best for content that contains sensitive information that you do not want to be cached or that is updated very frequently.

  • After - sets the amount of time after which the content will be expired. This setting is best for content that is updated regularly, such as on a daily or weekly basis. Type a value in the corresponding box and select one of the following values from the list: Second(s), Minute(s), Hour(s), Day(s).

  • On (in Coordinated Universal Time (UTC)) - sets an exact date and time when the content will expire. This setting is best for content that is not expected to change frequently.

See Also