Preflight check before upload (可选API)

Method	API	描述
OPTIONS	/context/files/content	上传前检查

请求体：

{
  "name": "集成说明.docx", //文件名称
  "size": 65537, //文件大小
  "pathType": "企业空间/个人空间/我的共享/收到的共享" //从box中获得
}

成功响应(200)：

{  
  "created_by": {  
    "id": "301",  
    "email": "docstest02@lenovo.com",  
    "name": "docstest02"  
  },
  "owner": {
    "id": "301",  
    "email": "docstest02@lenovo.com",  
    "name": "docstest02"
  },  
  "id": "483",  
  "modified_by": {  
    "id": "301",  
    "email": "docstest02@lenovo.com",  
    "name": "docstest02"  
  },  
  "description": "",  
  "name": "/study/Nodejs/Demo/集成说明.docx",
  "permissions": {  
    "write": "true",  
    "read": "true",
    "download": false,
    "print": true
  },  
  "created_at": "2020-03-25T02:57:38.000Z",  
  "modified_at": "2020-03-25T02:57:38.000Z",  
  "size": 0,
  "protection_status": "normal",  
  "version": "1"  
}

错误响应：
文件名冲突时返回409状态码