Downloading a File with Javascript

How can I download a file from the Box API using client-side javascript? I've tried the following:

var url = 'https://api.box.com/2.0/files/file_id/content';
var xhr = new XMLHttpRequest();
xhr.open('GET', url);
xhr.setRequestHeader('Authorization', 'Bearer '+my_token);
xhr.onload = function()
{
	//stuff
}
xhr.onerror = function()
{
        //more stuff
}
xhr.send();

When the request is made, though, the following error is thrown:

XMLHttpRequest cannot load https://api.box.com/2.0/files//content. The request was redirected to 'https://dl.boxcloud.com/d/1/.../download', which is disallowed for cross-origin requests that require preflight.

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