Enforce HTTPS in Asp.Net Core

HttpsEnforcer.cs

using System;

namespace Microsoft.AspNet.Builder
{
    public static class HttpsEnforcer
    {
        public static IApplicationBuilder UseHttpsEnforcer(this IApplicationBuilder app)
        {
            Func<RequestDelegate, RequestDelegate> middleware = next => async context =>
            {
                var req = context.Request;
                var res = context.Response;

                if (req.IsHttps)
                    await next(context);
                else
                    res.Redirect($"https://{req.Host}{req.Path}{req.QueryString}");
            };

            return app.Use(middleware);
        }
    }
}

Startup.cs

namespace MyProject
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app)
        {
            app.UseHttpsEnforcer();
        }
    }
}