Javascript: Cross-domain JSON request issues

I am trying to request JSON from Google Places API, but I am still getting the cross-domain request error after firstly including:

<?php 
header('Access-Control-Allow-Origin: *');
header("Access-Control-Allow-Methods: POST, GET");
header("Access-Control-Allow-Headers: x-requested-with");
?>开发者_开发技巧;

The JSON request I am using is standard JQuery:

function load() {
    var url = 'https://maps.googleapis.com/maps/api/place/details/json?reference=CnRhAAAARMUGgu2CeASdhvnbS40Y5y5wwMIqXKfL-n90TSsPvtkdYinuMQfA2gZTjFGuQ85AMx8HTV7axABS7XQgFKyzudGd7JgAeY0iFAUsG5Up64R5LviFkKMMAc2yhrZ1lTh9GqcYCOhfk2b7k8RPGAaPxBIQDRhqoKjsWjPJhSb_6u2tIxoUsGJsEjYhdRiKIo6eow2CQFw5W58&sensor=true&key=xxxxxxxxxxxxxx';
    $.ajax(url, {
       async:   true,
       success: function(data, textStatus, jqXHR) {
           dump(data);
       }
    });
}

I would use a JSONP query instead, but the Google Places API doesn't support JSONP...how can I solve this? With a proxy server? I am not sure how to go about this or what I'm doing wrong.

The URL you are requesting data from has to grant permission with access control headers. It would defeat the object of the same origin policy is a remote origin could grant permission to itself!

If the API you are using doesn't provide a JSON-P API, and doesn't set access control headers itself, then you need to use a proxy. Either one you run yourself, or a third party one that will convert to JSON-P (such as YQL).