如何启用连接: aps.net核心2.1的保持活动

services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
services.Configure<IISServerOptions>(options =>
{
    options.AllowSynchronousIO = true;
});

app.Use(async (context, next) =>
{
    context.Features.Get<IHttpMaxRequestBodySizeFeature>().MaxRequestBodySize = null;
    await next.Invoke();
});

<system.web>
  <httpRuntime targetFramework="4.7.2" maxRequestLength="2097151" />
</system.web>

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="2147483648" />
    </requestFiltering>
  </security>
</system.webServer>