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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 #webdev #js #100SecondsOfCode Install the quiz app 🤓 iOS https://itunes.apple.com/us/app/fireship/id1462592372?mt=8 Android https://play.google.com/store/apps/details?id=io.fireship.quizapp Upgrade to Fireship PRO at https://fireship.io/pro Use code lORhwXd2 for 25% off your first payment. My VS Code Theme - Atom One Dark - vscode-icons - Fira Code Font