Traffic Management for Next.js Apps Using Vercel Edge and Upstash Edge Flags

The process of blocking web app traffic from specific countries using Vercel Edge Middleware and Upstash Edge Flags is outlined in this guide, which emphasizes a dynamic, lightweight, and cost-effective approach that eliminates the need for code redeployment when updating country restrictions. Vercel Edge Middleware intercepts web requests to check geographic information like country and user-agent, and Upstash Edge Flags allows the management of these rules without modifying the code. The setup involves creating a Redis database and configuring edge flags to specify blocked countries, followed by setting up a Next.js project with the necessary packages and middleware to use these flags. The deployment to Vercel includes ensuring environment variables are correctly configured, and the functionality can be tested by simulating requests from different countries using a VPN.