getting the parameters for a report, using a restful call?

Hi,
I'm looking for a restful api call for getting all the parameters of a report, and their types.

I found this document http://infocenter.pentaho.com/help/t...g_biserver.pdf, but I do not see an endpoint that will return the parameters . However, I do see that the following calls work:

This document, http://wiki.pentaho.com/display/Repo...+Documentation , speaks of a renderMode paramater. And if set, to XML or PARAMTER. I would expect to get back the parameters for the report. Does this work for version 5.0?
What would the URL look like?
--> Gives error "No class registered for id reporting"
I couldn't get it to work. What do you use for solution? Given that http: //localhost:8180/pentaho/api/repos/: Public:Sample%20Reports:Sample1.prpt/generatedContent url works, what should the renderMode url look like?

I have also tried:
---> But I get an java.lang.IllegalArgumentException as the response, and nothing in the logs.

Thank you for your help.