run_middleware.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
      app.UseDeveloperExceptionPage();
    }
    else
    {
      app.UseExceptionHandler("/Home/Error");
      // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
      app.UseHsts();
    }

    app.Run(async context =>
    {
        await context.Response.WriteAsync("Response 1");
    });

    app.Run(async context =>
    {
        await context.Response.WriteAsync("Response 2");
    });
}