Pantheon Community

Incremental Rollout for new Drupal site

Are there any Pantheon customers who are using the same domain to point to 2 different Drupal applications? We plan on using the F5 to route certain paths to our new Drupal instance on Pantheon, otherwise it will fall through and route to our on prem Drupal servers. The challenge we are encountering is when assets are requested in the browser the base path is falling through to the on prem servers. We are looking for a slick solution for getting these assets requested by the browser without having to create F5 exceptions for each asset in our Pantheon Drupal instance.