Asterisk micro server

Hello, I have installed AsteriskNOW and configured it to work with one IP phone on extension 1001 using custom Voip provider over SIP protocol. So, there is no additional hardware in box.
Can anyone tell me how to use HTTP protocol to make call? When I make HTP request: … secret=***
I get:
Response: Success
Message: Authentication accepted

But after that I enter:
and get:
Response: Error
Message: Authentication Required

This commands are entered from FF browser. What I’m doing wrong? I need those commands to integrate AsteriskNOW with my new dialer…
Any help or example will be appreciated…