Third-party API blocked by CORS policy

We are working on integration of zoom app using the sample app provided in forum (zoomapps-advancedsample-react)
However, as we try to make a external API call from the app, we are getting this error -

“Access to XMLHttpRequest at ‘’ from origin ‘’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.”

Can you please help us to find the root cause here

We find a solution
we add a base URL in to App’s Allow List Domains now its working