title: Apache CXF RS request and response sizes
body: <p>How can i get request and response sizes in bytes in Apache CXF Rest service in order to log it in metrics db?
  "content-length" is not an option, can't find such a header on my messages.
  I need raw size, close enough to which i can get by WireShark, for example, when i make a tcp dump of my http session. </p>