Capturing HTTP Header Info

The easiest way is to assign a HTTP profile to your virtual server so you can make use of the HTTP parser and helper commands. Here's a CodeShare entry that logs all request and response headers in an HTTP connection

https://devcentral.f5.com/wiki/iRules.LogHttpHeaders.ashx

If you can't use an HTTP profile, you'll need to use the TCP::payload command to get the full content and then write some string processing to pull the values out.

-Joe