title: Loading of `$metadata` fails due service from https://services.odata.org not supporting CORS
body: <p>I am trying to consume Northwind R/W OData service link: <code>https://services.odata.org/V3/OData/OData.svc/</code>.</p>
  <p>It is working fine on local testing. But without using proxy or mock server, the service reports the following error:</p>
  <blockquote>
  <p>NetworkError: 501 Not Implemented</p>
  </blockquote>
  <p>Controller code:</p>
  <pre class="lang-js prettyprint-override"><code>// ODataModel required from &quot;sap/ui/model/odata/v2/ODataModel&quot;
  var oModel = new ODataModel({
    serviceUrl: &quot;https://services.odata.org/V3/OData/OData.svc/&quot;,
    headers: {
      DataServiceVersion: &quot;3.0&quot;,
      MaxDataServiceVersion: &quot;3.0&quot;
    }
  });
  </code></pre>