System.Net.Http.OwinHttpMessageHandler.RequestState.GenerateResponse C# (CSharp) Method

            internal HttpResponseMessage GenerateResponse()
            {
                _sendingHeaders();

                var response = new HttpResponseMessage
                {
                    StatusCode = (HttpStatusCode) OwinContext.Response.StatusCode,
                    ReasonPhrase = OwinContext.Response.ReasonPhrase,
                    RequestMessage = _request,
                    Content = new StreamContent(_responseStream)
                };
                // response.Version = owinResponse.Protocol;

                foreach (var header in OwinContext.Response.Headers)
                {
                    if (!response.Headers.TryAddWithoutValidation(header.Key, header.Value))
                    {
                        response.Content.Headers.TryAddWithoutValidation(header.Key, header.Value);
                    }
                }
                return response;
            }