CORS issue in ionic4

I am using Angularfire 2 and calling cloud function from my ionic 4 app.How to solve the following CORS issue in ionic 4 ??

Access to fetch at ‘’ from origin ‘http://localhost:8100’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.

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Late to the discussion, but in case anyone else with a similar issue stumbles upon this …It’s not actually the CORS policy that’s the problem, you shouldn’t be connecting to a null-… address. FunctionsRegionToken needs to be imported along with the AngularFireFunctionsModule in app.module and then added to the providers array with the region id you’re using: { provide: FunctionsRegionToken, useValue: }

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