Making 'POST' request using Javascript

Hello Community,

I am a beginner in developing acrobat functionalities. I have written a folder level script to make a submenu in adobe acrobat pro which when pressed makes a POST request to a dummy server. I have been able to make GET requests without no problem but for POST requests I keep getting the following error :

"NotAllowedError: Security settings prevent access to this property or method" in the following code which I have taken from https://gist.github.com/randycasburn/802f278c3cfef0873dd086c34bbb9fee to make post requests. Any kind of help regarding this would be highly appreciated.

Thanks.

Edit : After reading some responses I have edited to make those required changes. But still, I am getting error.

Here is the code:

// Make HTTP POST request
ajax = app.trustedFunction(function(fURL,doc) {
// Create some Stream object: 
strObj = doc.createDataObject("myData", "This is the data");
    app.beginPriv();
    Net.HTTP.request({ cVerb:"POST", cURL:fURL,  oRequest: strObj, oHandler: ajaxCallback});
    app.endPriv();
});
// process the response
ajaxCallback = {
    response:function(msg,uri,e){
        var stream = msg;
        var string = "";
        var error = e == undefined? 'No HTTP errors' : "ERROR: " + e.toSource();
        string = SOAP.stringFromStream( stream );
        oResult = JSON.parse(string);

        console.println(error);
        console.println( "id: " + oResult.id);
        console.println( "userId: " + oResult.userId);
        console.println( "title: " + oResult.title);
        console.println( "body: " + oResult.body);
    }
};
// Add menu item to kick it all off 
app.addMenuItem({
     cName: "Get Mock Data", cParent: "File",
     cExec: 'ajax("https://jsonplaceholder.typicode.com/posts/1", this);',
     nPos: 0});