title: Origin null is not allowed by Access-Control-Allow-Origin not working with jsonp
body: <p>I searched, many answers here. But I tried it all, It still does not work for me. I want to to get <code>json</code> data from <code>web service</code> (cross domain).</p>
  
  <pre><code>var url1 = 'http://localhost:33219/iSes/Pro/RfsPro.svc/GetPro/';
  $.getJSON(url1,function(json){
      alert('testing');
  });
  </code></pre>
  
  <p>I got error from <code>Chrome</code> console <code>Origin null is not allowed by Access-Control-Allow-Origin</code>.</p>
  
  <p>These are what I tried to do, by searching the answers here :</p>
  
  <ol>
  <li><p>Put <code>/?callback=?</code> to url :</p>
  
  <pre><code>var url1 = 'http://localhost:33219/iSes/Pro/RfsPro.svc/GetPro/?callback=?';
  </code></pre></li>
  <li><p>I found <code>chrome.exe --allow-file-access-from-files</code> but if we use this, do the clients that browse our website have to do it too?</p></li>
  <li><p><a href="https://stackoverflow.com/questions/6396623/jquery-getjson-access-control-allow-origin-issue">This answer, 3rd option</a> related to <code>CORS</code>, using <code>PHP</code> to configure the header, How could I do this with <code>ajax</code> or <code>jquery</code>? Because  my project is using <code>backbone.js</code>not <code>PHP</code>.</p></li>
  </ol>