rasa_nlu_ajax_call.js

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        //custom action to process this.responseText
    }
};
xhttp.open("POST", "http://localhost:5005/model/parse");
xhttp.setRequestHeader("Content-Type", "application/json");

//replace Hello with input message
xhttp.send(JSON.stringify({text:'Hello'}));