function upload(callback) {

    let boundaryKey = '----' + new Date().getTime();    // 用于标识请求数据段

    let options = {

        host: 'localhost', // 远端服务器域名

        port: 80, // 远端服务器端口号

        method: 'POST',

        path: `/upload`, // 上传服务路径

        headers: {

            'Content-Type': 'multipart/form-data; boundary=' + boundaryKey,

            'Connection': 'keep-alive'

        }

    };

    let req = http.request(options, function(res){

        res.setEncoding('utf8');

        res.on('data', function(chunk) {

            console.log('body: ' + chunk);

        });

        res.on('end', function() {

            console.log('res end.');

        });

    });

    /*req.write(

         '--' + boundaryKey + 'rn' +

         'Content-Disposition: form-data; name="upload"; filename="test.txt"rn' +

         'Content-Type: text/plain'

     );*/

    req.write(

        `--${boundaryKey}rn Content-Disposition: form-data; name="${self.path}"; filename="${self.file}"rn Content-Type: text/plain`

    );

    // 创建一个读取操作的数据流

    let fileStream = fs.createReadStream(this.filePath);

    fileStream.pipe(req, {end: false});

    fileStream.on('end', function() {

        req.end('rn--' + boundaryKey + '--');

        callback && callback(null);

    });

}