OWA2013 some requests breaking APM session

Ok, it seems to be two different issues.

The additional request towards "/owa/ev.owa2" after the logout can be catched and solved with the iRule from Stanislas:

when HTTP_REQUEST {
    switch -glob [string tolower [HTTP::path]] {
        "/owa/ev.owa2*" {
            if { !([ACCESS::session exists [HTTP::cookie value MRHSession]]) } {
                drop
            }
        }
    }
}

But the other issue with the initial request towards "/owa/sessiondata.ashx" seems to be some caching issue. With an incognito-tab in Chrome for example everything is fine. I also added this code to the iRule:

when HTTP_RESPONSE {
    HTTP::header replace Pragma no-cache
    HTTP::header replace Cache-Control no-cache
    HTTP::header replace Expires -1
}

And it seems to help a little bit, but didn't work all the time and across different browser.

What I already mentioned before, I'm totally wondering why I get the "Outlook Web App" Loading screen displayed when this "/owa/sessiondata.ashx" URL is requested. I mean why is this bypassing the APM?

Can I workaround this with another iRule code or is this something which can be adjusted in the application?

Thank you!

Ciao Stefan 🙂