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Cross Origin Resource Sharing (CORS) lets servers specify what origins can access resources through XHR by setting HTTP headers (e.g. Access-Control-Allow-Origin).

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Configure Access-Control-Allow-Origin for clients with origin: null

Have the server send the header with a valid value, or, if an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. … However, Is there an advantage in allowing any origin over disabling CORS? There must be one, otherwise this option is nonsense... …
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