title: How to connect to a PUSH server via http in Qt5
body: <p>Reviewing QNetworkAccessManager I don't see anything 'push' related. <a href="http://qt-project.org/doc/qt-5/qnetworkaccessmanager-members.html" rel="nofollow">http://qt-project.org/doc/qt-5/qnetworkaccessmanager-members.html</a> 
  Unlike POST or GET, with 'push' http connection, you are maintaining the connection so you can receiving periodic updates from the server.
  What is the correct function to use for a HTTP REST 'push' client connection in Qt5? Or possibly a persistent http connection?</p>