title: Cordova iOS Cross origin requests are only supported for HTTP
body: <p>I'm building an iOS app and recently upgraded cordova-ios to 4.1.0 and started using: cordova-plugin-wkwebview-engine.</p>
  
  <p>The problem is that now I get the error message <code>Cross origin requests are only supported for HTTP</code> while trying to load dependencies, so the app won't start.</p>
  
  <p>It's trying to load systemjs dependencies over file://, but I included  in my config.js.</p>
  
  <p>I have no clue how to fix this. Does anyone have experience with this bevaviour?</p>
  
  <p>cordova version: 6.1,0
  cordova ios version: 4.1.0</p>
  
  <p>related config.xml bit:</p>
  
  <pre><code>&lt;access origin="*" /&gt;
  &lt;feature name="CDVWKWebViewEngine"&gt;
    &lt;param name="ios-package" value="CDVWKWebViewEngine" /&gt;
  &lt;/feature&gt;
  
  &lt;preference name="CordovaWebViewEngine" value="CDVWKWebViewEngine" /&gt;
  </code></pre>