gistfile1.cs

  public class RunscopePassagewayHandler : DelegatingHandler {
        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) {
            if (request.RequestUri.Host.Contains("passageway.io")) {
                var uriWithoutPort = request.RequestUri.GetComponents(UriComponents.AbsoluteUri & ~UriComponents.Port, UriFormat.UriEscaped);
                request.RequestUri = new Uri(uriWithoutPort);
            }
            return base.SendAsync(request, cancellationToken);
        }
    }