tye/samples/apps-with-ingress/ApplicationB/Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace ApplicationB
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGet("/{**path}", async context =>
                {
                    var instance = Environment.GetEnvironmentVariable("APP_INSTANCE") ?? Environment.GetEnvironmentVariable("HOSTNAME");
                    var text = 
                        "Hello from Application B " + instance + Environment.NewLine +
                        "Path is: " + context.Request.Path;
                    await context.Response.WriteAsync(text);
                });
            });
        }
    }
}