It's REALLY easy to create a Reverse HTTP Server with Web API

Global.asax.cs

private void SetupRouting(HttpConfiguration config)
{
  config.Routes.MapHttpRoute("proxy_else", "{*uri}", new
    {
        controller = "Proxy",
        uri = RouteParameter.Optional
    });
}

ProxyController.cs

using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http;
using System;
using System.Configuration;

namespace MyApp.Controllers
{
    public class ProxyController : ApiController
    {
        readonly HttpClient _client = new HttpClient();

        [HttpGet, HttpPost, HttpPut, HttpDelete, HttpPatch, HttpHead, HttpOptions]
        public async Task<IHttpActionResult> HandleRequest()
        {
            Request.RequestUri = TransformUri(Request.RequestUri);

            if (Request.Method == HttpMethod.Get || Request.Method == HttpMethod.Head)
                Request.Content = null;

            var response = await _client.SendAsync(Request);
            return ResponseMessage(response);
        }

        protected override void Dispose(bool disposing)
        {
            using (_client)
                base.Dispose(disposing);
        }

        private Uri TransformUri(Uri requestUri)
        {
            var ub = new UriBuilder(requestUri);
            ub.Host = ProxiedUri.Host;
            ub.Port = ProxiedUri.Port;
            return ub.Uri;
        }

        private static readonly Uri ProxiedUri = new Uri(ConfigurationManager.AppSettings["ProxiedUrl"]);
    }
}