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For web platform, browsers has a built-in security mechanism "Cross-Origin Resource Sharing". It prevents unauthorized access to resources from another domain.
By default, Skygear only allow access to your app in the same domain. It would allow micro-services deployed to Skygear, since they shares the domain. However, if you would like to access your app's resources from another domain, you need to configure Cross-Origin policy in Advanced Settings page of Portal.