Uncaught TypeError: DOM object constructor cannot be called as a function.

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C#

Javascript

Hi guys

I am trying to get a method from a generic Handler File using JavaScript.
I get the error "Uncaught TypeError: DOM object constructor cannot be called as a function."

here is my function from .js file

var httpReq = null;
    httpReq = XMLHttpRequest();
    httpReq.onreadystatechange = XMLHttpRequest;
    httpReq.open("/_Property/PropertyGH.ashx?method=save");
    httpReq.send(null);