ASP.NET Core 中的速率限制中间件如何配置？

var builder = WebApplication.CreateBuilder(args);

// 添加速率限制服务

builder.Services.AddRateLimiter(options =>

{

    options.AddFixedWindowLimiter(policyName: "fixed", context =>

    {

       context.PermitLimit = 5; // 每窗口允许请求数

       context.Window = TimeSpan.FromSeconds(10); // 窗口长度

       context.QueueProcessingOrder = QueueProcessingOrder.OldestFirst;

       context.QueueLimit = 1; // 排队请求上限

    });

});

var app = builder.Build();

// 使用速率限制中间件

app.UseRateLimiter();

app.Run();

app.MapGet("/api/values", () => "Hello World")

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    .RequireRateLimiting("fixed");

app.UseRateLimiter();

app.UseRouting();

app.UseAuthorization();

app.MapControllers().RequireRateLimiting("fixed");

options.AddTokenBucketLimiter("token", context =>

{

    context.TokenLimit = 10;

    context.TokensPerPeriod = 2;

    context.ReplenishmentPeriod = TimeSpan.FromSeconds(5);

});

options.OnRejected = (context, cancellationToken) =>

{

    context.HttpContext.Response.StatusCode = 429;

    return context.HttpContext.Response.WriteAsync("Too many requests.");

};