let conf= {
      onUploadProgress: function (progressEvent) {
        let percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total);
      },
      headers: { 'content-type': 'application/x-www-form-urlencoded' }
    };

let a = new FormData();
    a.append('file', file[0]);


    axios
      .put(url, a, conf)
      .then(function (res) {
        console.log(res.data);
      })
      .catch(function (err) {
        console.log(err);
      });