get whole post body within codeigniter controller

I'm running XMLHttpRequest request like this:

var data = JSON.stringify({
    name : "123",
    id : 12

window.console.log("Submitting: " + data);
var req = new XMLHttpRequest();'POST', "http://localhost/index.php/lorem/ipsum", true);
req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
req.onreadystatechange = function() {
    if (  req.readyState==4) {
        window.console.log( "Sent back: " + req.responseText );

as you can see there's no name for parameter being passed.

now I want to read that JSON data inside ipsum function of lorem controller. How can I do this? $this->input->post(); returns false :(


Use file_get_contents('php://input')

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