Forum Discussion

KeesvandenBos's avatar
KeesvandenBos
Icon for MVP rankMVP
Jan 26, 2017

Modify LTM+APM inactivity timer on one url

Hi,

 

I have a website behind the APM in LTM+APM mode. The default inactivity timeout is 15 minutes. This should stay 15 minutes for this site except for one url. This is a url to a form which takes very long to fill out. (in portal mode the user receiver a java pop-up when there are 5 minutes left to go in the session, asking the user to disconnect or to continue)

 

I have tested it with an irule to change the session.inactivity_timeout when the uri of the form is hit. It is changes to the new value but under manage sessions the timeout still stays 15 minutes.

 

Is there a way to send the portal mode inactivity pop-up to users in LTM+APM mode? Or is there a way to insert a small java script that will keep the session alive when visiting this one uri?

 

Cheers,

 

Kees

 

application delivery
BIG-IP Access Policy Manager (APM)
security

1 Reply

  • stan_piron's avatar
    stan_piron
    Icon for Cumulonimbus rankCumulonimbus
    Jan 26, 2017

    Hi,

    to insert a javascript, you can use this irule:

    when RULE_INIT {
    set static::jscript {}
}

when ACCESS_ACL_ALLOWED {
     Disable the stream filter by default 
    if { [catch {STREAM::disable}] } {log local0. "Stream disable error"}
    set insertJscript 0 
    HTTP::header remove "Accept-Encoding"
    set extend_session 0
    if {[HTTP::uri] equals /myuri } {set extend_session 1}
}


when HTTP_RESPONSE { 
    if {$extend_session && ([HTTP::status] == 200) && ([HTTP::header value Content-Type] contains "text")} { 
        set insertJscript 1
        STREAM::expression "@@$static::jscript@"
        STREAM::enable
    }
    if {[HTTP::header exists "Transfer-Encoding"]} {
        HTTP::payload rechunk
    }
}


when STREAM_MATCHED {
     Once we've hit one match, disable the stream filter for the rest of the response
    if { $insertJscript} {
        log local0. "Session Closed detection : Javascript inserted"
        STREAM::disable
    }
}

    then, add the following script file in APM hosted content with private properties (I do not remember the real keyword):

    function detectSessionClosed()
{
    var rq = new XMLHttpRequest();
    rq.open("GET","/public/share/myjavascript.js",false);
    rq.send(null);
    if (rq.status === 302) {
      window.location.assign("/vdesk/hangup.php3");
    }
}

setInterval( detectSessionClosed, 600000);

    this script try to download itself every 10 minutes until the user leave the page.