Android Question Sending http post request with RequestHeaders.

Hi all,
It had been a while for me on B4A.
My app is running great, but now i like to send http post requests. I foud that there is a new library "okhttp".
I have been digging for 2 day's on the forms. But I cant seem to find what i'm looking for.
Is there an example on how to send requests and receive data back?

PLease advice