Https redirect

You need to examine [HTTP::uri] as well. So that your if clause does not trigger for every request, but instead only for where uri is set to /.

Something like this

when HTTP_REQUEST { 
    if { [HTTP::host] equals "test.com" && [HTTP::uri] equals "/" } { 
       HTTP::redirect "https://test.com/testing"
    } 
}

/Andreas