protected override async Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var stopWatch = ValueStopwatch.StartNew();
var response = await base.SendAsync(request, cancellationToken);
var responseStream = await response.Content.ReadAsStreamAsync();
var wrapper = new EndOfStreamDetectingStream(responseStream, delegate
{
CreateChild(request, response).Observe(stopWatch.GetElapsedTime().TotalSeconds);
});
// Replace the Content with an implementation that observes when it has been fully read.
var oldContent = response.Content;
response.Content = new StreamContent(wrapper);
// Copy headers.
foreach (var header in oldContent.Headers)
{
response.Content.Headers.TryAddWithoutValidation(header.Key, header.Value);
}
return(response);
}
static async Task <int> ReadAsyncCore(EndOfStreamDetectingStream stream, Task <int> readTask)
{
int read = await readTask;
if (read == 0)
{
stream.SignalCompletion();
}
return(read);
}