@Override
            public ApiRequest getHead() {
                return request;
            }
@see io.apiman.gateway.engine.policy.IDataPolicy#getRequestDataHandler(io.apiman.gateway.engine.beans.ApiRequest, io.apiman.gateway.engine.policy.IPolicyContext, java.lang.Object)
plugins/transformation-policy/src/main/java/io/apiman/plugins/transformation_policy/TransformationPolicy.java