Unable to resolve service for type 'AspNetCoreRateLimit.IProcessingStrategy' while attempting to activate 'AspNetCoreRateLimit.IpRateLimitMiddleware
4.x起，需在Startup.cs的ConfigureServices(IServiceCollection services)中注冊：
services.AddSingleton<IProcessingStrategy, AsyncKeyLockProcessingStrategy>();
https://github.com/stefanprodan/AspNetCoreRateLimit/releases/tag/4.0.0