title: Download file via jquery ajax post
body: <p>I am trying to export my web page data and download it as excel file. but the download does not start even the response return succeed.</p>
  
  <pre><code>$.ajax({
        type: "POST",
        url: _url,
        contentType: 'multipart/form-data;boundary=SzB12x',
        data: json,
      });
  </code></pre>
  
  <p>The responseText something like this:</p>
  
  <p>PK�J;Fxl/theme/theme1.xml�YOo�6�<em>���,[r��n;v��i����#-�kJH:�oC{0<code>X7�2</code>��mZ<code>���d��u@�(٦b:M����</code>�����{|��^�0t@��*"w$�!0I�[�՚n�i��'����iH� g�,��|�J�!���hRh�h��?r&amp;�L ���߶S��v@���#��׮�"���}��Жt%�hR�t"������+�����</em>���u{ނ��0K���oy�9OTWywkAͯ�
  ���F�� 6*�����[���U���</p>
  
  <p>I think its the file but I cant download it!!</p>
  
  <p>Any help please?</p>
  
  <p>Thanks!</p>