The first message on the top sends urlencoded data which, as I understand. is the standard/default way of sending data to the web server. It should be very very easy to decode the data on the serp end: check for header and if the "Content-Type" header value is "application/x-www-form-urlencoded" then just run the corresponding function.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST