Browser freezes and no redirection occurs , is it cache issue?

Caching can indeed be a hindrance in troubleshooting, especially in Chrome. Disabling cache helps, but Chrome often doesn't seem to bypass all caching.

Browsers aren't the best app to troubleshoot iRules, although there are some plug-ins (like HTTP header monitors) that can be helpful. The developer modes in various browsers can also give you more information.

A much better tool to see what's going on are apps like Fiddler. However, browser cache could still affect the observations, as can active connections (as changes to iRules often don't take effect for existing connections).

cURL is probably one of the best options for quick troubleshooting. Although it's a Linux app, you can run it on Windows through apps like Cygwin.

Try something like this to see what's being returned:

curl -I http://www.domain.com/path