public Task<HttpResponseMessage> SendAsync(HttpRequestMessage message, HttpCompletionOption option, CancellationToken token)
{
#if NET_3_5
if(_connectionCount >= _connectionLimit) {
return Task.Delay(500).ContinueWith(t => SendAsync(message, option, token)).Unwrap();
}
Interlocked.Increment(ref _connectionCount);
#else
return _sendSemaphore?.WaitAsync()?.ContinueWith(t =>
{
#endif
var challengeResponseAuth = Authenticator as IChallengeResponseAuthenticator;
if (challengeResponseAuth != null) {
_authHandler.Borrow(x => x.Authenticator = challengeResponseAuth);
challengeResponseAuth.PrepareWithRequest(message);
}
var httpClient = default(HttpClient);
if(!_httpClient.AcquireTemp(out httpClient)) {
return null;
}
(Authenticator as ICustomHeadersAuthorizer)?.AuthorizeRequest(message);
return httpClient.SendAsync(message, option, token)
#if NET_3_5
.ContinueWith(t =>
{
Interlocked.Decrement(ref _connectionCount);
return t.Result;
})
#endif
;
#if !NET_3_5
})?.Unwrap()?.ContinueWith(t =>
{
message.Dispose();
_sendSemaphore?.Release();
if(t.IsFaulted) {
var e = t.Exception;
if(Misc.UnwrapAggregate(e) is ObjectDisposedException) {
return null;
}
throw e;
}
return t.Result;
});
#endif
}