Echo request/response in HttpMessageHandler

authenticator.cs

#if DEBUG
            Debug.WriteLine("Request:");
            Debug.WriteLine(request.ToString());
            if (request.Content != null)
            {
                var bytes = await request.Content.ReadAsByteArrayAsync();
                Debug.WriteLine(bytes.Length);
                Debug.WriteLine(Encoding.UTF8.GetString(bytes, 0, bytes.Length));
                Debug.WriteLine(await request.Content.ReadAsStringAsync());
            }
            Debug.WriteLine("");
#endif

            // Send the request, with auth headers if available
            var r = await base.SendAsync(request, cancellationToken).ConfigureAwait(false);

#if DEBUG
            Debug.WriteLine("Response:");
            Debug.WriteLine(r.ToString());
            if (r.Content != null)
            {
                Debug.WriteLine(await r.Content.ReadAsStringAsync());
            }
            Debug.WriteLine("");
#endif