Laravel 5.1 xmlHttpRequest AJAX POST TokenMismatchException

The relevant code is shown below:

var csrfToken = "{{ csrf_token() }}";
xmlhttp.open("POST", "/internal/v1/create/strategy", true);
xmlhttp.setRequestHeader('X-CSRF-TOKEN', csrfToken);
postString = "param1=" + varOne + "?param2=" + varTwo;
xmlhttp.send(postString);

I've been trying to figure this out for hours now, I honestly have no idea what to do at this point. Note, that if I use the form method everything works just fine. I've also tried sending the CSRF token as a parameter in the postString: "_token=" + csrfToken

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