php cors error

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02 Apr 2018

1/**
2 *  An example CORS-compliant method.  It will allow any GET, POST, or OPTIONS requests from any
3 *  origin.
4 *
5 *  In a production environment, you probably want to be more restrictive, but this gives you
6 *  the general idea of what is involved.  For the nitty-gritty low-down, read:
7 *
8 *  - https://developer.mozilla.org/en/HTTP_access_control
9 *  - https://fetch.spec.whatwg.org/#http-cors-protocol
10 *
11 */
12function cors() {
13    
14    // Allow from any origin
15    if (isset($_SERVER['HTTP_ORIGIN'])) {
16        // Decide if the origin in $_SERVER['HTTP_ORIGIN'] is one
17        // you want to allow, and if so:
18        header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
19        header('Access-Control-Allow-Credentials: true');
20        header('Access-Control-Max-Age: 86400');    // cache for 1 day
21    }
22    
23    // Access-Control headers are received during OPTIONS requests
24    if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
25        
26        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
27            // may also be using PUT, PATCH, HEAD etc
28            header("Access-Control-Allow-Methods: GET, POST, OPTIONS");         
29        
30        if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
31            header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
32    
33        exit(0);
34    }
35    
36    echo "You have CORS!";
37}
38

source

Horace

10 Nov 2016

1Access-Control-Allow-Headers does not allow * as accepted value, see the Mozilla Documentation here.
2
3Instead of the asterisk, you should send the accepted headers (first X-Requested-With as the error says).

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