<!DOCTYPE html> <html> <head> <title>Tests that preflight requests returning invalid 301 status code result in error.</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/common/get-host-info.sub.js"></script> </head> <body> <script type="text/javascript"> async_test((test) => { const xhr = new XMLHttpRequest; xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-invalid-status.py?code=301"); xhr.setRequestHeader("x-pass", "pass"); xhr.onerror = test.step_func_done(function() { assert_equals(xhr.status, 0); }); xhr.onload = test.unreached_func("Invalid 301 response to preflight should result in error."); xhr.send(); }, "Request with 301 preflight response"); </script> </body> </html>