Major Description
A number of users have experienced issues with large headers causing issues. There needs to be a way to increase the Jetty request and response header buffer size. See this stackoverflow link for information about how that is done in Jetty.
http://stackoverflow.com/questions/11914555/jetty-http-413-header-full-error-java-scala
From looking at the code this would need to be done in the start() method of GatewayServer.