Network error in xmlhttprequest GET

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Javascript

Below is the piece of code I used in a script:

var xhReq = new XMLHttpRequest();
xhReq.open("GET", url, false);
xhReq.send(null);
var serverResponse = xhReq.responseText;

If I paste the url on a browser, the results in json format display. However, when I run this piece of code, I get

800a139e - JavaScript runtime error: NetworkError

I have searched around but can't find a proper solution for it. What will be the possible solution? Thanks.

What I have tried:

0x800a139e - Network error in XMLHttpRequest