问题上传文件Node＆amp;反应

Question

在我的项目中，我只是试图从我的React前端上传文件到我的Node服务器。这是我使用axios的服务器的简单帖子，但似乎数据要么没有被发送，要么无法被解释。我也试图使用express-fileupload作为解决方案，但它似乎没有解决问题。以下是代码段：

React（App.js）

var URLs = {
   imgUpload: 'http://127.0.0.1:8003/imgUpload'
};

class App extends Component {

  ...

  uploadHandler = () => {

    console.log('handling upload...')
    if (this.state.activeFile == null) {
      alert('Please Select an Image!!');
    } else {
    let af = this.state.activeFile;
    console.log('active file: ' + JSON.stringify(af))

    let data = new FormData();
    data.append('file', af);
    data.append('name', af.name);
    console.log('attempting to post: ' + JSON.stringify(data))
    axios.post(URLs.imgUpload, data, {
     headers: { 'Content-Type': 'multipart/form-data' }
    }
)
    }
  }

  addFile = (event: any): void => {
    let activeFile = event.target.files[0];
      console.log('Added file ' + activeFile);
      this.setState ({
        activeFile: activeFile,
      });
  }

render() {
 return (
  <div className="App">

   ...

   <FormGroup>
       <ControlLabel htmlFor="fileUpload" style={{ cursor: "pointer" }}><h3><Label bsStyle="success">Add file</Label></h3>
           <FormControl
            id="fileUpload"
            type="file"
        //    accept=".pdf"
            onChange={this.addFile}
            style={{ display: "none" }}
        />

           <Button bsStyle="success" onClick={this.uploadHandler}>Upload</Button>
       </ControlLabel>
   </FormGroup>
  </div>
);
}
}

节点

 const fileUpload = require('express-fileupload');
 var express = require('express')
 var app = express();



app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});
 ...

 app.post('/imgUpload', function(req, res) {
     let img = req;
     console.log('attempting to upload image, searching for data...')
     console.log('Files: ' + req.files)
     var body = "";
        req.on('data', function (data) {
            body += data;

            // 1e6 === 1 * Math.pow(10, 6) === 1 * 1000000 ~~~ 1MB
            if (body.length > 1e6) {
                // FLOOD ATTACK OR FAULTY CLIENT, NUKE REQUEST
                req.connection.destroy();
            }
        });

 });

网站控制台：

节点控制台：

attempting to upload image, searching for data...
Files: undefined