One Vs for Redirects

The following rule works for me - note: I'm using version 10.1 for this testing. What version are you using? I ask because the way we reference data groups has changed and that may be affecting you.

Step 1: I created a data group called 'dc-post' and added two entries - note that I left the 'value' field blank.

"www.foo.com www.google.com"

"www.bar.com www.yahoo.com"

  
   when HTTP_REQUEST {    
       set Host [findclass [HTTP::host] dc-post " "]  
  log local0. "Host var is $Host"   
       if { $Host ne "" } {   
            HTTP::redirect http://$Host[HTTP::uri]   
            }   
    }  
  

Note that there's one change to the rule above: I added the 'http://' to the redirect. It'll work either way, but my original rule was confusing (for it to work you'd need to specify 'http://www.foo.com' in your data group for the first field as opposed to just the hostname). Sorry for the confusion on that.

At any rate, this appears to be working fine. Please let me know if you still have problems.

-Matt