Using Edge Flags in Next.js Middleware

Edge-Flags is a tool designed to manage feature flags for serverless applications, leveraging Upstash Redis and geolocation rules to customize content delivery based on user location. The guide demonstrates how to implement Edge-Flags in a Next.js middleware to restrict content access to users within the EU by creating a Redis database and a feature flag named "eu-countries." It provides instructions for setting up a Next.js app, installing the necessary packages, and creating a middleware file to check the user's location and redirect non-EU users to a specific "blocked" page. Deployment to Vercel is necessary to test the geolocation functionality, as local development does not support geolocation data.