CSharp-Coder

Learn ASP.NET Core rate limiting with fixed window, sliding window, token bucket and concurrency limiters. Runnable C# examples — secure your API today. If your API is public, it will get hammered — by bots, by misconfigured clients stuck in retry loops, and occasionally by someone actively trying to knock it over. ASP.NET Core rate limiting is the built-in defense for this. Since .NET 7, the Microsoft.AspNetCore.RateLimiting middleware ships in the framework, and in 2026 with .NET 9 and .NET 10 it's mature, fast, and flexible enough that you no longer need a third-party package for most scenarios. In this guide you'll learn what rate limiting actually protects you from, how the four built-in algorithms differ (and which one to choose), and how to wire up a production-ready configuration with per-user partitions, proper 429 responses, and the pitfalls that trip up most teams. Why Rate Limiting Matters for API Security Rate limiting caps how many requests a client can...