HEAD /files/lala%20123 HTTP/1.1
User-Agent: aws-sdk-nodejs/2.5.1 darwin/v6.9.1
Content-Length: 0
Host: 127.0.0.1
X-Amz-Date: Thu, 08 Dec 2016 02:30:57 GMT
Authorization: AWS 123:w2ovDawhTCLfIieR9Iba3bwHpBc=
Connection: keep-alive

