Connection to Big- IP for a SharePoint Client App

Hi, I need to build a third part client application to crawl a SharePoint for a certain type of files, The company that is asking me this is working with SharePoint 2010 with form authentication and has a F5 Big-Ip server in front. I was wondering is there any way to pass that Big-Ip so that I can log on the SP server. Like any API or Http request header that I can use to passe that? I do have registered credential to connect that works from any browser, but as I use CSOM to connect to SharePoint all I get is an empty response.

Thanks for your help :) Regards, Pascal.