JavaScript front-end and Progress4GL back-end

I want to create an application with front-end HTML + JavaScript and back-end Progress4GL.

I found this documentation: http://communities.progress.com/pcom/docs/DOC-106147 (see Introducing AJAX and Introducing JSON). In the example described it is used GET method when requesting data:

xmlhttp.open("GET", "http://localhost/cgi-bin/cgiip.exe/WService=wsbroker1/getcustomersJSON_param.p?piCustNum="+ custval, true);
xmlhttp.send();


and on Progress4GL procedure for getting the param it is used get-value("piCustNum").

In my application I want to use POST method. So the request will be, for example:

xmlhttp.open("POST","http://localhost/cgi-bin/cgiip.exe/WService=wsbroker1/getcustomersJSON_param.p",true);
xmlhttp.send("piCustNum=" + custval);


But I don't know how to get the sent param on Progress side. Actually I want to send a stringify JSON.

Can anyone help me with this? Thanks!

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