help with Irule to change url from servername

I am creating a VIP and the customer would like to have that is in the url changed.

 

Right now when you go to https://cstest.abc.com/cslogin.html it will return the following http://servername.abc.com:7777/sso/pages/cs_login/login.jsp

 

It looks like the redirection is being done on the server so is there a way I create an irule that change servername.abc.com:7777 to cstest.abc.com ?

 

Thanks

 

Shawn