title: Cordova custom URL scheme not work on IOS (unsupported URL)
body: <p>I am trying to use deep links to external apps like the following : </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;Col&gt;
                &lt;a href="https://www.youtube.com/channel/channelname/" className="external"&gt;&lt;img src="static/youtube.png" width='35px' alt=""/&gt;&lt;/a&gt;
                &lt;/Col&gt;
                &lt;Col&gt;
                &lt;a href="instagram://user?username=username" className="external"&gt;&lt;img src="static/instagram.png" width='31px' alt=""/&gt;&lt;/a&gt;
                &lt;/Col&gt;
                &lt;Col&gt;
                &lt;a href="twitter://user?screen_name=username" className="external"&gt;&lt;img src="static/twitter.png" width='35px' alt=""/&gt;&lt;/a&gt;
                &lt;/Col&gt;
                &lt;Col&gt;
                &lt;a href="whatsapp://send?phone=+00000000" className="external"&gt;&lt;img src="static/whatsapp.png" width='35px' alt=""/&gt;&lt;/a&gt;
                &lt;/Col&gt;</code></pre>
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  <p>it's work fine in android but i have the following error in IOS </p>
  
  <p><strong><em>Failed to load webpage with error: unsupported URL</em></strong></p>
  
  <p>my config.xml file whitelist </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>    &lt;allow-intent href="whatsapp:*" /&gt;
      &lt;allow-intent href="instagram:*" /&gt;
      &lt;allow-intent href="twitter:*" /&gt;
  
      &lt;platform name="android"&gt;
          &lt;allow-intent href="market:*" /&gt;
      &lt;/platform&gt;
      &lt;platform name="ios"&gt;
          &lt;allow-intent href="itms:*" /&gt;
          &lt;allow-intent href="itms-apps:*" /&gt;
          &lt;allow-intent href="instagram:*" /&gt;    
          &lt;allow-intent href="twitter:*" /&gt;
      &lt;/platform&gt;</code></pre>
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  <p>please any advise .. </p>