I have a J2EE application running on following deployment architecture
F5 LB --> Varnish 4 on RHEL 7 --> APACHE 2.4 on RHEL7 --> WebLogic 12.1.2.1 http proxy plug-in --> WebLogic 12.1.2.1
Case: In all such cases where user does a form submit (http post) and after performing some action (say database save) application server does 302 redirects to a new page (success page). Weblogic adds a lag of approx 30 sec before redirecting to success page.
Genesis of problem: This problem we have started facing recently when we did platforms upgrade.
Pls note following
Old setup - radware LB + varnish 3.0.6 on RHEL6 + Apache 2.2 + weblogic 10.3.6(11g)(above mentioned use case works fine)
New setup - F5 LB + (RHEL 7 + apache 2.4 + weblogic 12.1.2.1) with following versions of varnish
No varnish - works fine
Varnish 3.0.6 - weblogic adds 30 sec delay
Varnish 4/5 - works fine on firefox, weblogic adds 30 sec delay on IE 11