code: private String serverUrl() {
          if (context.containsKey(AgentBootstrapperArgs.SERVER_URL)) {
              return (String) context.get(AgentBootstrapperArgs.SERVER_URL);
          } else {
              return "http://" + context.get("hostname") + ":" + context.get("port") + "/go";
          }
      }
docs: and they stuff "hostname" and "port" in the context, the new bootstrapper stuffs the (ssl) serverUrl directly