apim-developer-portal2/src/components/help/articles/cors.html

API management developer portal

<p>
    The interactive console of the Developer portal makes client-side API requests directly from the browser, this requires
    Cross-Origin Resource Sharing (CORS) enabled on the server.
</p>
<p>
    You can enable it by adding a CORS policy on your API(s).
    <a href="https://aka.ms/AA4e482" target="_blank">Learn more</a>
</p>