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blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present

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I am working on an always free Oracle ATP database, with Oracle Apex installed.

I am experimenting with PWA (Progressive Web Applications) and using Vincent Morneau's blog

https://vmorneau.me/apex-pwa-part4/

But after adding the manifest file I get the following error when running the page:

Access to manifest at 'https://cloud.oracle.com/datawarehouse' (redirected from 'https://g9856a918ecb2cf-dev.adb.eu-amsterdam-1.oraclecloudapps.com/manifest.json') from origin 'https://g9856a918ecb2cf-dev.adb.eu-amsterdam-1.oraclecloudapps.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

I have no clue where the '

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