Hapijs头不是有效的json

出于某种原因,我使用 request.headers 不是有效的JSON,这意味着我似乎无法解析它。我得到的标题如下:

{ host: 'localhost:3000',
  'content-type': 'application/json',
  origin: 'http://localhost:3000',
  'accept-encoding': 'gzip, deflate',
  cookie: '__utma=111872281.423941909.1445035542.1451387074.1451408560.20; __utmc=111872281; __utmz=111872281.1445035542.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __jlptid4483=5633968d7051f52c388b457d; _ga=GA1.1.423941909.1445035542; ci_session=a%3A4%3A%7Bs%3A10%3A%22session_id%22%3Bs%3A32%3A%2214408339bad21514d3a8deab593087ef%22%3Bs%3A10%3A%22ip_address%22%3Bs%3A9%3A%22127.0.0.1%22%3Bs%3A10%3A%22user_agent%22%3Bs%3A116%3A%22Mozilla%2F5.0+%28Macintosh%3B+Intel+Mac+OS+X+10_10_5%29+AppleWebKit%2F601.3.9+%28KHTML%2C+like+Gecko%29+Version%2F9.0.2+Safari%2F601.3.9%22%3Bs%3A13%3A%22last_activity%22%3Bi%3A1451413507%3B%7De88c3d74bb7153f8ddfb600814f1f249; csrftoken=Cw6hhwpl4RWtvXqRfqmfeok6cE33cvT4; sessionid=8gvksyocsx4ffcsp22ucgkxf84l7y4tg; spu_box_8075=true; wp-settings-time-1=1446207423',
  connection: 'keep-alive',
  accept: 'application/json',
  'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/601.3.9 (KHTML, like Gecko) Version/9.0.2 Safari/601.3.9',
  referer: 'http://localhost:3000/documentation',
  'content-length': '67',
  'accept-language': 'en-us' }

这基本上意味着我无法提取用户代理,这正是我试图获取的。

如果有人能帮我解析这个,或者找到一个更简单的方法来获取用户代理。