How can I implement rate limiting in my ASP.NET Core API?

How can I implement rate limiting in my ASP.NET Core API?

You can implement rate limiting in your ASP.NET Core API using middleware. One popular library is 'AspNetCoreRateLimit'. Would you like a code example?

Yes, please provide a code example.

First, install the package via NuGet: Install-Package AspNetCoreRateLimit. Then, configure it in your Startup.cs file. Here's a basic setup:

public void ConfigureServices(IServiceCollection services) {
    services.AddOptions();
    services.AddMemoryCache();
    services.Configure<IpRateLimitOptions>(options => {
        options.GeneralRules = new List<RateLimitRule> {
            new RateLimitRule {
                Endpoint = "*",
                Limit = 100,
                Period = "1h"
            }
        };
    });
    services.AddInMemoryRateLimiting();
    services.AddSingleton<IRateLimitConfiguration, RateLimitConfiguration>();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
    app.UseIpRateLimiting();
}

This will limit requests to 100 per hour for all endpoints.

What if I want to set different limits for different endpoints?

You can specify different rules for different endpoints in the GeneralRules list. For example:

options.GeneralRules = new List<RateLimitRule> {
    new RateLimitRule {
        Endpoint = "GET:/api/values",
        Limit = 10,
        Period = "1m"
    },
    new RateLimitRule {
        Endpoint = "*",
        Limit = 100,
        Period = "1h"
    }
};

This sets a limit of 10 requests per minute for the /api/values endpoint.