How can we comunicate parameters to a bsp application?

Hi

We are developing a BSP application, and we want to send parameters from an abap program. We have thought to do it, appending the parameters into the url.

But, into bsp application, we don''t know how get that parameters. we have tried using the metoth

GET_URI_PARAMETER of the cl_http_request class, but it doesn't work.

Could somebody help us?