Cross-Origin Resource Sharing or CORS is a mechanism that allows browsers to request data from 3rd party URLs (or origins) and is a common pain point for web developers. Learn the basics of CORS in 100 seconds. 

Full Tutorials

Use CORS in Firebase Cloud Functions https://fireship.io/lessons/secure-firebase-cloud-functions/

Helpful CORS Resources

https://web.dev/cross-origin-resource-sharing/
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS


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