I don't think you can output it like that because the request parameters are actually inside the HTTP body (it's POST and not GET). If you really want to output it like that, the easiest way is to do this (it's a hack, though).
SCJP 5.0, SCWCD 1.4, SCBCD 1.3, SCDJWS 1.4
Joined: Jun 26, 2002
You could also inherit from HttpClient and add the behaviour you want.