Thanks Lori for giving me the heads-up on HTTP 2.0. As for troubleshooting, I find that f5 High Speed Logging has already solved the problem. Set up HSL (it's easy), incorporate it in your iRules, Comment it out when you're not troubleshooting - much easier/faster than packet-captures. We have SSL to the back-end servers (because 3rd party vendors can't code their products well) - once I set up HSL, life got much easier.