OperatedClientConnection conn = scop.createConnection();
try {
System.out.println("opening connection to " + target);
scop.openConnection(conn, target, null, ctx, params);
System.out.println("sending request");
conn.sendRequestHeader(req);
// there is no request entity
conn.flush();
System.out.println("receiving response header");
HttpResponse rsp = conn.receiveResponseHeader();