Mule cxf:proxy endpoint behind load-balancer uses

Question

As title, we had a simple service design that uses a cxf:proxy endpoint inside an http-inbound enpoint, and the Mule server is behind load-balancer which does ssl offloading.

When user requested with https://url?wsdl, in the returned wsdl, we found mule writes the service address in http. Is there any way that we could change it to https here?

We are using mule 3.5.2 here.

PS. The Load-balancer is F5 and belongs to 'network team', we could ask for the X-Forwarded-Proto header, but only if we confirm it will work? (I have no clue, also need help here please)