CONSOLE ERROR: XMLHttpRequest cannot load http://127.0.0.1:8000/xmlhttprequest/resources/access-control-allow-lists.php?origin=%00*. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8000' is therefore not allowed access. -------- Frame: '-->' -------- Check that exact matching is used when comparing a request's originating url and the value provided by Access-Control-Allow-Origin. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Should disallow origin: '*' PASS xhr.send(null) threw exception NetworkError: Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'http://127.0.0.1:8000/xmlhttprequest/resources/access-control-allow-lists.php?origin=%00*'.. PASS successfullyParsed is true TEST COMPLETE