let request = obj => {
  return new Promise((resolve, reject) => {
      let xhr = new XMLHttpRequest();
      xhr.open(obj.method || "GET", obj.url);
      if (obj.headers) {
          Object.keys(obj.headers).forEach(key => {
              xhr.setRequestHeader(key, obj.headers[key]);
          });
      }
      if(obj.responseType) {
        xhr.responseType = obj.responseType;
      }
      
      xhr.onload = () => {
          if (xhr.status >= 200 && xhr.status < 300) {
              resolve(xhr.response);
          } else {
              reject(xhr.statusText);
          }
      };
      xhr.onerror = () => reject(xhr.statusText);
      xhr.send(obj.body);
  });
};

export default request;