<!DOCTYPE html> <html> <head> <title>Test that async CORS requests with custom headers are sent with OPTIONS preflight</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"> async_test((test) => { let xhr = new XMLHttpRequest; const uuid = token(); xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/reset-token.py?token=" + uuid, false); xhr.send(); xhr = new XMLHttpRequest; xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/no-custom-header-on-preflight.py?token=" + uuid); xhr.setRequestHeader("x-test", "foobar"); xhr.onerror = test.unreached_func("Unexpected error"); xhr.onload = test.step_func_done(() => { assert_equals(xhr.responseText, "PASS"); }); xhr.send(); }, "Preflighted async request with custom header"); </script> </body> </html>