Discover Virt returns http error code 413 when the request header large

Hi,

When I try to record GET requests with Discover Virt, I get the http error code 413 back when my request header is large (seems to be around 4000 bytes).  I have tried to set the vm option: -Dsoapui.mock.connector.headerBufferSize=30000 but that did not resolve the problem.  Anybody any ideas how I can increase the max header size used during discovery?