Request song api

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Hello!
I would like to customize the song music request widget. The problem is that it uses a JavaScript (request.js).
I analyzed the request.js and realized that the form sends a "GET" for rpc.php file.
Can I create my own form and send the "GET" to rpc.php file? What variables do I need to rpc.php accept the request?

sorry for my english. Im using a google translator