$.post('/cgi-bin/cp_json_test.pl', {},function (data) {console.dir(data) } );
> Object {readyState: 1, getResponseHeader: function, getAllResponseHeaders: function, setRequestHeader: function, overrideMimeType: function…}
> Object

$.post('/cgi-bin/cp_json_test.plx', {},function (data) {console.dir(data) } );
> Object {readyState: 1, getResponseHeader: function, getAllResponseHeaders: function, setRequestHeader: function, overrideMimeType: function…}
> Content-Type: application/json; charset=ISO-8859-1 {"is":"simple","this":"test"}