response-headers.https.any.js

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This WPT test may be referenced by the following Test IDs:
- /webtransport/response-headers.https.any.html - WPT Dashboard Interop Dashboard
- /webtransport/response-headers.https.any.serviceworker.html - WPT Dashboard Interop Dashboard
- /webtransport/response-headers.https.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /webtransport/response-headers.https.any.worker.html - WPT Dashboard Interop Dashboard

// META: global=window,worker

// META: script=resources/webtransport-test-helpers.sub.js

promise_test(async t => {

  // https://w3c.github.io/webtransport/#process-a-webtransport-fetch-response

  // Step 6: "wt-protocol" is a negotiation-only header and must be deleted

  // from responseHeaders before it is exposed to script (the negotiated

  // protocol itself is exposed via WebTransport.protocol instead).

  const options = { protocols: ['a', 'b', 'c'] };

  const wt = new WebTransport(

      webtransport_url('custom-response.py?wt-protocol="b"'), options);

  t.add_cleanup(() => wt.close());

  await wt.ready;

  assert_equals(wt.protocol, 'b');

  assert_not_equals(wt.responseHeaders, null);

  assert_equals(wt.responseHeaders.get('wt-protocol'), null,

                'wt-protocol must not be exposed via responseHeaders');

}, 'wt-protocol is stripped from responseHeaders');

promise_test(async t => {

  // https://w3c.github.io/webtransport/#process-a-webtransport-fetch-response

  // Step 7: transport.[[ResponseHeaders]] is an immutable Headers object.

  const wt = new WebTransport(webtransport_url('echo.py'));

  t.add_cleanup(() => wt.close());

  await wt.ready;

  assert_not_equals(wt.responseHeaders, null);

  assert_throws_js(TypeError, () => wt.responseHeaders.set('x-custom', 'evil'));

  assert_throws_js(TypeError, () => wt.responseHeaders.append('x-custom', 'evil'));

  assert_throws_js(TypeError, () => wt.responseHeaders.delete('x-custom'));

}, 'responseHeaders is immutable');