1)
  case VC_EVENT_ERROR:
  case VC_EVENT_INACTIVITY_TIMEOUT:
  case VC_EVENT_ACTIVE_TIMEOUT:
    // The user agent is hosed.  Close it &
    //   bail on the state machine
    if (t_state.http_config_param->log_spider_codes) {
      t_state.squid_codes.wuts_proxy_status_code = WUTS_PROXY_STATUS_SPIDER_TIMEOUT_WHILE_DRAINING;
      t_state.squid_codes.log_code = SQUID_LOG_ERR_SPIDER_TIMEOUT_WHILE_DRAINING;
      t_state.squid_codes.hier_code = SQUID_HIER_TIMEOUT_DIRECT;
    }
    vc_table.cleanup_entry(ua_entry);
    ua_entry = NULL;
    t_state.client_info.abort = HttpTransact::ABORTED;
    terminate_sm = true;
    return 0;
  }

  // Reset the inactivity timeout if this is the first
  //   time we've been called.  The timeout had been set to
  //   the accept timeout by the HttpClientSession
  //
  if (client_request_hdr_bytes == 0) {
    ua_session->get_netvc()->set_inactivity_timeout(HRTIME_SECONDS(t_state.txn_conf->transaction_no_activity_timeout_in));
  }


2) LG가 많은 이유는 reponse_hdr 에 대한 timeout인것같아요
  case HttpTransact::HTTP_API_SEND_REPONSE_HDR:
    // Set back the inactivity timeout
    if (ua_session) {
      ua_session->get_netvc()->set_inactivity_timeout(HRTIME_SECONDS(t_state.txn_conf->transaction_no_activity_timeout_in));
    }
    // we have further processing to do
    //  based on what t_state.next_action is
    break;