<!DOCTYPE html> <html> <head> <title>Sync request denied at preflight because of non-CORS-safelisted header</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/common/get-host-info.sub.js"></script> <script src="/common/utils.js"></script> </head> <body> <script type="text/javascript"> const uuid = token(); const url = get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-denied.py?token=" + uuid; test(() => { let xhr = new XMLHttpRequest; xhr.open("GET", url + "&command=reset", false); xhr.send(); xhr = new XMLHttpRequest; xhr.open("GET", url + "&command=header", false); xhr.setRequestHeader("x-test", "foo"); assert_throws_dom("NetworkError", () => xhr.send()); xhr = new XMLHttpRequest; xhr.open("GET", url + "&command=complete", false); xhr.send(); assert_equals(xhr.responseText, "Request successfully blocked."); }, "Sync request denied at preflight"); </script> </body> </html>