using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public class GetPublicIp {

​

    /// <summary>

    /// account for possbility of ELB sheilding the public IP address

    /// </summary>

    /// <returns></returns>

    public static string Execute() {

        try {

            Console.WriteLine(string.Join("|", new List<object> {

                    HttpContext.Current.Request.UserHostAddress,

                    HttpContext.Current.Request.Headers["X-Forwarded-For"],

                    HttpContext.Current.Request.Headers["REMOTE_ADDR"]

                })

            );

​

            var ip = HttpContext.Current.Request.UserHostAddress;

            if (HttpContext.Current.Request.Headers["X-Forwarded-For"] != null) {

                ip = HttpContext.Current.Request.Headers["X-Forwarded-For"];

                Console.WriteLine(ip + "|X-Forwarded-For");

            }

            else if (HttpContext.Current.Request.Headers["REMOTE_ADDR"] != null) {

                ip = HttpContext.Current.Request.Headers["REMOTE_ADDR"];

                Console.WriteLine(ip + "|REMOTE_ADDR");

            }

            return ip;

        }

        catch (Exception ex) {

            Console.Error.WriteLine(ex.Message);

        }

        return null;

    }

}

}