title: getting preflight issue in file:/// cordova app
body: <p>I am using this meta tag for CSP- </p>
  
  <pre><code>&lt;meta http-equiv="Content-Security-Policy" content="default-src * gap: file:; style-src 'self' 'unsafe-inline'; img-src 'self' data:; script-src * 'unsafe-inline' 'unsafe-eval' ws: wss:;"&gt;
  </code></pre>
  
  <p>And when trying to get local html then its not loading. 
  In console also its showing error. </p>
  
  <pre><code>[Error] Failed to load resource: Preflight response is not successful (login.html, line 0)
  [Error] XMLHttpRequest cannot load file:///Users/.../Library/Developer/CoreSimulator/Devices/.../data/Containers/Bundle/Application/.../test.app/www/templates/login.html. Preflight response is not successful
      success (backbone.js:487)
      l (jquery-2.0.2.min.js:5:24887)
      fireWith (jquery-2.0.2.min.js:5:25704)
      k (jquery-2.0.2.min.js:7:4931)
      (anonymous function) (jquery-2.0.2.min.js:7:8725)
  </code></pre>
  
  <p>Using this code to get local html(Using backbone)- </p>
  
  <pre><code>$.get( './templates/login.html', function(data) {
    template = _.template(data);
    _this.$el.append(template);
  });
  </code></pre>
  
  <p>Before update above code was working fine. I update iOS and Cordova to latest then I am getting this issue. </p>
  
  <p>Any suggestions?</p>