This URL keeps an existing user session alive. The GET request to this URL must contain a ApplicationSessionId that has been returned by a Logon URL. It returns only an HTTP status code, with no response body. A request to this URL internally calls the “/UserAuth/KeepAlive” URL to check that the user session is still active, and to keep it alive.

If you do not use the KeepAlive URL, the user session timeouts after the interval that is specified by the SessionTimeout web.config property (the default interval is 10 minutes). Updates to the “last used time” of the internal user session are cached and the LastUpdated field of the user and application session tables are updated at the rate that is specified by the DatabaseKeepAliveUpdateInterval web.config property (the default value is 1 minute).