QNetworkAccessManager - finished signal (when emitted)

[RavensAngel]

I have a REST-service which i access using an HTTP POST. Using soap ui, i get timings like 30 ms. When using QNetworkaccessmanager (connecting the finished signal, direct connection) i get 230 ms.

I used wireshark to check what is going on...

What i see is that both ways are sending the same messages:

• TCP SYN (time: 15.9528600)
• TCP SYN, ACK (time: 15.9536980)
• ACK (time: 15.9537440)
• HTTP POST (time: 15.9549770)
• HTTP REPLY (time: 15.9998710)
• TCP ACK (time: 16.1998570) --> the time difference between the last HTTP reply and the ack is +/- 200 ms...

The question is, is the finished signal emitted after the TCP ack in QNetworkAccessManager and can i force the signal to be emitted faster? Is it normal it waits to ack the reply before sending the finished signal? If so, is there another signal i can use to get the reply sooner?

Or am I doing it wrong?

Part of code:

_am = new QNetworkAccessManager();
connect( _am, SIGNAL( finished( QNetworkReply* ) ), this, SLOT( _requestFinished( QNetworkReply* ) ), Qt::DirectConnection );
...
QNetworkRequest request( _requestData.url );
request.setHeader( QNetworkRequest::ContentTypeHeader,"application/json" );
 _elapsed.restart();
_reply = _am->post( request, _requestData.data );

I time using QElapsedTimer just before doing the post and within the _requestFinished slot i take the elapsed time and output it.
I always see 200+ ms...

Any help? Or ideas?

Thanks in advance.