With FlourineFX being used as client, how to deal with Header AppendToGatewayUrl

Question

I am using FlourineFX (trunk from 2010/07) as a client to talk to a Apache Axis Server dealing out AMF data.

I can connect fine but the server issues a header.

Name: AppendToGatewayUrl
Must Understand: true
Content =";jsessionId=0003048u39483948940";

How would I go about amending the URL to append the string with Flourine?