如何解决火炮中的XHR民意调查错误？

Question

我具有以下用于测试websocket的配置：

config:
  target: "ws://localhost:6969/subscriptions"
  phases:
    - duration: 2
      arrivalRate: 5
    - duration: 2
      arrivalRate: 5
      rampTo: 4000
    - duration: 2
      arrivalRate: 50
  ws:
      # Ignore SSL certificate errors
      # - useful in *development* with self-signed certs
      rejectUnauthorized: false
scenarios:
    - engine: "socketio"
      flow:
        - send: {"type":"connection_init","payload":{"headerFor":"AllTabs"}}
        - send: {"id":"1","type":"start","payload":{"variables":{},"extensions":{},"operationName":null,"query":"subscription {\n hello_world {\n message\n }\n}\n"}}  
        - think: 200
        - send: {"id":"1","type":"end"}

然后我运行artillery run hello.yml，我可以看到xhr poll error：

  Elapsed time: 10 seconds
  Scenarios launched:  1346
  Scenarios completed: 0
...
  Errors:
    Error: xhr poll error: 1344

我从浏览器复制粘贴了我的两个 send 请求，因此它们很可能是正确的。如何查看此错误的完整输出？