Redirect non www and https issue

The best way that I've found to do this is using the

event

Because you can't have multiple redirects, you would either need to set a flag to say a redirect has already occurred and check it later (which obviously wouldn't work for the built-in rule). Otherwise, you could use the event command. I would say you could change the Location header in the HTTP_RESPONSE event, but I don't think that gets executed when you do a redirect from an iRule.

So, my suggestion would be something like this:

when HTTP_REQUEST { 
    if { [string tolower [HTTP::host]] equals "pennyforlondon.com" } { 
         Disable further events for this connection 
        event disable all

         Redirect the user. Make sure to add the Connection Close header because the event command is set per connection. So we need a new connection in order for the rules to execute again.
        HTTP::respond 301 Location "***REPLACE***[HTTP::uri]" "Connection" "Close"
    } 
} 

NOTE: Replace

***REPLACE***

Hope this helps.