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Proxying is a technique which enables the cross domain loading of data (not necessary for json data types)

The following is a simple PHP example (but a completely open one) be sure to define the path to your proxy as a global variable on the page

 var proxy = "/cgi-bin/proxy.php?";

or define your urls in terms of your proxy var proxypath = "/cgi-bin/proxy.php?"; var url = proxypath+"url="+datasourceurl; You can and probably should restrict the values allowed for the url, i $_GET['url'] unless you are building a gateway or similar, use at your own risk.

proxy.php src:
$header[] = "Content-type: text/xml";
$post_data = '';
    $post_data = $GLOBALS['HTTP_RAW_POST_DATA'];
    $header[] = "Content-length: ".strlen($post_data);

$ch = curl_init( urldecode($_GET['url']) ); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 
curl_setopt($ch, CURLOPT_TIMEOUT, 160);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_FAILONERROR, 0);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 

if ( strlen($post_data)>0 ){
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
$response = curl_exec($ch);     
if (curl_errno($ch)) {
    print curl_error($ch);
} else {
    print $response;

The above proxy script is fully open, and there are people who will tell you (if you have a rather targeted use like always getting from google or similar single source you might want to change it to test $_GET['url'] variable to see if the script is being called for your purpose