AJAX X-Requested-With header is not propagated

[giles-v]

Steps to reproduce:

• Create a PHP script which echoes the contents of $_SERVER['HTTP_X_REQUESTED_WITH']
• Request it directly in AJAX (e.g. using jQuery, doing $(".output").load("test.php") or similar)
• Request it via the proxy in AJAX, e.g. $(".output").load("proxy.php?mode=native&url=test.php")

Expected result:

• The proxied script returns the same response for both requests

Actual result:

• The response differs

Suggested fix:
Insert the following above the CURLOPT_FOLLOWLOCATION line:
// forward X-Requested-With header to ensure that if the server has an AJAX-specific response,
// it is preserved when using this proxy.
$headers_to_send = array();
if (isset($_SERVER['HTTP_X_REQUESTED_WITH'])) $headers_to_send[] = 'X-Requested-With: ' . $_SERVER['HTTP_X_REQUESTED_WITH'];
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers_to_send );