请求如下：
HTTP/1.1 200 OK
Connection: keep-alive
Date: Sat, 15 Nov 2014 11:15:21 GMT
X-Powered-By: Express
content-length: 278
content-type: application/json

{
"file": {
"buffer": null,
"encoding": "7bit",
"extension": "pdf",
"fieldname": "file",
"mimetype": "text/plain",
"name": "f459076685288eed5b4b45f80a11b908.pdf",
"originalname": "test.pdf",
"path": "uploads/f459076685288eed5b4b45f80a11b908.pdf",
"size": 59353,
"truncated": false
}
}
谢谢