public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
  if (env.IsDevelopment())
  {
    app.UseDeveloperExceptionPage();
  }

  // Matches request to an endpoint.
  app.UseRouting();

  // Endpoint aware middleware. 
  // Middleware can use metadata from the matched endpoint.
  app.UseAuthentication();
  app.UseAuthorization();

  // Execute the matched endpoint.
  app.UseEndpoints(endpoints =>
  {
    // Configure the Health Check endpoint and require an authorized user.
    endpoints.MapHealthChecks("/healthz").RequireAuthorization();

    // Configure another endpoint, no authorization requirements.
    endpoints.MapGet("/", async context =>
    {
      await context.Response.WriteAsync("Hello World!");
    });
  });
}

  app.Use(next => context =>
      {
        var endpoint = context.GetEndpoint();
        if (endpoint is null)
        {
          return Task.CompletedTask;
        }
        Console.WriteLine($"Endpoint: {endpoint.DisplayName}");

        if (endpoint is RouteEndpoint routeEndpoint)
        {
          Console.WriteLine("Endpoint has route pattern: " +
            routeEndpoint.RoutePattern.RawText);
        }

        foreach (var metadata in endpoint.Metadata)
        {
          Console.WriteLine($"Endpoint has metadata: {metadata}");
        }
        return next(context);
      });

// ---- 截取自https://github.com/dotnet/aspnetcore/blob/master/src/Security/Authorization/Policy/src/AuthorizationMiddleware.cs-----
if (endpoint != null)
{
  context.Items[AuthorizationMiddlewareInvokedWithEndpointKey] = AuthorizationMiddlewareWithEndpointInvokedValue;
}
var authorizeData = endpoint"color: #ff0000">结论

端点路由：允许ASP.NET Core应用程序在中间件管道的早期确定要调度的端点，

以便后续中间件可以使用该信息来提供当前管道配置无法提供的功能。
这使ASP.NET Core框架更加灵活，强化端点概念，它使路由匹配和解析功能与终结点分发功能脱钩。
https://github.com/dotnet/aspnetcore/blob/master/src/Security/Authorization/Policy/src/AuthorizationMiddleware.cs