APM - Session Expired/Timeout: Start a new session link

Using what Kevin provided above as a starting point, I was able to get this working to support our requirements. Thanks Kevin!

In our case an external SAML SP is redirecting to the BigIP as an IdP for one of any number of URLs so we need to be able to redirect the browser to the originating URL in the event of a page timeout etc...

In case others have similar requirements, this was accomplished by creating the iRule below and referencing in the custom variable in the various page "a href" tags (e.g. "click here" link shown above).

when ACCESS_SESSION_STARTED {
    need to set a custom variable using the orig referer URL so we can_
    modify any links i.e. modal dialogue & point them back to the SP._
    This will be used by referencing the custom var as follows._
    within the html tags for "a href" put "%{session.custom.myvar}"

   ACCESS::session data set session.custom.myvar [HTTP::header value Referer]
}