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9 lines
391 B
JavaScript
9 lines
391 B
JavaScript
// META: global=window,worker
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// META: title=Response: error static method
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promise_test (async () => {
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const response = await fetch("../resources/data.json");
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assert_throws_js(TypeError, () => { response.headers.append("name", "value"); });
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assert_not_equals(response.headers.get("name"), "value", "response headers should be immutable");
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}, "Ensure response headers are immutable");
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