maintaining the request URL

We're moving from an Apache Weblogic plugin SSL -Weblogic, to a BIG IP SSL - Weblogic configuration, and have a webstart application that uses the request.getRequestURL() method to populate the codebase for the jnlp response. The original URL was passed through just fine with the Apache Weblogic plugin, but is translated through the BIG IP. What is the best practice for populating the codebase for a jnlp response? Do I need to write an iRule to send through the original URL?