Irule to modify server response

But the new url is now showing in the user browser as https://int-sales.local.loc

it is shown in user browser because you use HTTP::redirect. check the following article about redirect and invisible rewrite.

Redirects, Rewrites and App Transfers via iRules by Colin Walker

if you want to rewrite embedded url in response body, you may try stream profile.

sol8115: Overview of the Stream profile

hope this helps.