Assistance with iRule for substitue/redirect - LTM

Hi,

what will happen if you directly went to this?

 http://testsite2.com/testapp/unsubs/unsubscribe.php

try this:

when HTTP_REQUEST {
    if { [HTTP::host] equals "testsite2.com" && [HTTP::uri] starts_with "/unsubscribe.php" } {
        HTTP::respond 301 noserver Location "/testapp/unsubs/unsubscribe.php"
    }
 }

OR

when HTTP_REQUEST {
    if { [HTTP::host] equals "testsite2.com" && [HTTP::uri] starts_with "/unsubscribe.php" } {
        HTTP::redirect "http://testsite2.com/testapp/unsubs/unsubscribe.php"
    }
 }

SELECTED ANSWER - This will keep your parameters and will only replace the url:

when HTTP_REQUEST {
    if { [HTTP::host] equals "testsite2.com" && [HTTP::uri] starts_with "/unsubscribe.php" } {
        set uri [string map {"/unsubscribe.php" "/testapp/unsubs/unsubscribe.php"} [HTTP::uri]] 
        HTTP::redirect "http://[HTTP::host]$uri" 
    }
 }