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Open API (Swagger) Integration for Confluence Failing with CORS Error

The following error started happening recently within the Confluence pages where I have included the embedded Open API Swagger plugin for documenting our APIs.

Fetch error

Fetch error

Possible cross-origin (CORS) issue? The URL origin ( does not match the page ( Check the server returns the correct 'Access-Control-Allow-*' headers.
We use Atlassian/Confluence online via the Cloud, and I don't believe that we have access to the header values.  Is there anything that can be done to overcome this error?

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