Http > Https redirect with a modification to the URL.

I tried using the default http > https url redirect on an application yesterday but when I would redirect, the application would break. Turns out, there is code built into the application that specifics a port number and so what I think is happening is http://www.application.com:80 is being redirected to https://www.application.com:80 so trying https over port 80. How could I modify the iRule so that it rewrites the URL to eliminate the port :80 part? The application owner said he might be able to modify it in their code, but I would like a back up plan.