Client Request:
=========================
       PING q4s://www.example.com Q4S/1.0
       Session-Id: 53655765
       Sequence-Number: 0
       User-Agent: q4s-ua-experimental-1.0
       Measurements: l=22, j=12, pl=0.20, bw=
       Content-Length: 0
=========================

Server Response:
=========================
  Q4S/1.0 200 OK
       Session-Id: 53655765
       Sequence-Number: 0
       Content-Length: 0
=========================