"cluster": "main_internal",
                                    "upgrade_configs": [
                                      {
                                        "upgrade_type": "CONNECT",
                                        "connect_config": {}
                                      }
                                    ]
                                  }

                        "server_name": "istio-envoy",
                        "use_remote_address": false,
                        "upgrade_configs": [
                          {
                            "upgrade_type": "websocket"
                          }
                        ],
                        "stream_idle_timeout": "0s",
                        "normalize_path": true,

                                    "cluster": "main_internal",
                                    "upgrade_configs": [
                                      {
                                        "upgrade_type": "CONNECT",
                                        "connect_config": {}
                                      }
                                    ]
                                  }
                                }