indicating progressbar

[cahyowhy]

how to provide a progress when post or get wit this library?
i tried this but doesnt work?

service(type = this.method.get, url = '', authorization = null, body = null) {
    const context = this;
    return new Ember.RSVP.Promise(
      function (resolve, reject) {
        fetch(url, {
          method: type,
          headers: {
            'Content-Type': 'application/json',
            "Authorization": authorization
          },
          body: body,
          xhrFields: {
            onprogress: function (e) {
              context.debug(e);
            }
          }
        }).progress(function (progress) {
          context.debug(progress);
        }).then(function (response) {
          resolve(response);
        }).catch(function (error) {
          reject(error);
        })
      });
  },

[tchak]

fetch have no support for progress events. The solution is to use streams. But the streams are not supported in polyfill. This is how it is supposed to work https://jakearchibald.com/2015/thats-so-fetch/#streams