    function redirect(code) {
        var test = async_test(document.title + " (" + code + ")")
        test.step(function() {
          var client = new XMLHttpRequest()
          client.onreadystatechange = function() {
            test.step(function() {
              if(client.readyState == 4) {
                assert_equals(client.getResponseHeader("x-request-method"), null)
                assert_equals(client.getResponseHeader("x-request-content-type"), null)
                assert_equals(client.respo