ajax和php的自定义标头

Question

So, I'm having a problem retrieving custom headers from ajax call.

This is my ajax call:

$.ajax({
    url: 'api.php',
    type: 'get',
    processData: false,
    beforeSend: function(xhr) {
        xhr.setRequestHeader('HASH', '5c268592cd4db9c7f6b813bb689005c6');
    },
    success: function(data) {
        console.log(data);
    },
    error: function(xhr, status, error) {
        console.log(xhr);
    }
});

And in my api.php, I have this:

<?php
    $headers = getallheaders();
    print_r(json_encode($headers));

the output:

......
"Access-Control-Request-Headers":"content-type,hash",
....

This returns null:

echo $headers['hash'];
// or this echo $headers['HASH'];

Answer 1

Try this $_SERVER["HTTP_HASH"];