CSharp-Coder

Learn ASP.NET Core rate limiting with built-in .NET middleware. Fixed window, sliding window, token bucket & code examples. Secure your API today! If your API is public, it will be abused — by scrapers, misconfigured clients stuck in retry loops, brute-force login bots, or a single power user hammering an expensive endpoint. ASP.NET Core rate limiting is the first line of defense, and since .NET 7 it has been built directly into the framework via the Microsoft.AspNetCore.RateLimiting middleware — no third-party packages required. In this tutorial you'll learn how to configure all four built-in rate limiting algorithms in .NET 8, 9, and 10, how to apply limits per user or per IP address, how to return proper 429 Too Many Requests responses, and the pitfalls that trip up production deployments (especially behind load balancers). Why Rate Limiting Matters in 2026 Rate limiting is not just a security checkbox. It solves several distinct problems, and knowing which pro...