4上传文件 websocket测试 POST /flow/doc/record/upload 响应结果 ```json { "msg": "success", "code": 20000, "data":{ "/proj/server/toolkit/flow/file/2021090220210902104854_back.jpg" } } ```
```json { "msg": "success", "code": 20000, "data":{ "/proj/server/toolkit/flow/file/2021090220210902104854_back.jpg" } } ```