http forwarding with irule

Do you need to forward using the DNS name (testserver.de)?

If you can use the IP address instead, you could simply do the following since you are not changing the URI:

        
     when HTTP_REQUEST {         
        if { [HTTP::host] matches_regex "server1.com" } {         
            Replace the Host: header with the new name        
           HTTP::header replace "host" "testserver.de"        
             
            You could also modify the uri with HTTP::uri "new uri"        
             
            a.b.c.d is the IP address of testserver.de        
           use node a.b.c.d 80        
        }        
     }         
     

If you do need to use the DNS name, then you will want to look at the following post:

Click here for link