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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Response: error static method</title>
<meta name="help" href="https://fetch.spec.whatwg.org/#response">
<meta name="help" href="https://fetch.spec.whatwg.org/#concept-network-error">
<meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(function() {
var responseError = Response.error();
assert_equals(responseError.type, "error", "Network error response's type is error");
assert_equals(responseError.status, 0, "Network error response's status is 0");
assert_equals(responseError.statusText, "", "Network error response's statusText is empty");
assert_equals(responseError.body, null, "Network error response's body is null");
assert_true(responseError.headers.entries().next().done, "Headers should be empty");
}, "Check response returned by static method error()");
test(function() {
const headers = Response.error().headers;
// Avoid false positives if expected API is not available
assert_true(!!headers);
assert_equals(typeof headers.append, 'function');
assert_throws_js(TypeError, function () { headers.append('name', 'value'); });
}, "the 'guard' of the Headers instance should be immutable");
</script>
</body>
</html>