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<!DOCTYPE html>
<meta charset="utf-8">
<title>HTTP Cache: Cache-Control with Pragma: no-cache</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
promise_test(async _t => {
// According to https://www.rfc-editor.org/rfc/rfc9111.html#name-pragma
// the pragma header is deprecated.
// When there's a mismatch between pragma and Cache-Control then the latter
// should be respected, and the resource should be cached, but this could
// lead to web-compat issues when one browser caches and others don't.
// It's safer to avoid caching when Pragma: no-cache is present, even though
// this further ossifies its use.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1937766 and
// https://issues.chromium.org/issues/447171250 for discussion.
const url = 'resources/cached_pragma_rand.py'
// First fetch to populate the cache
const response1 = await fetch(url, { cache: 'default' });
assert_true(response1.ok, 'First fetch should succeed');
const text1 = await response1.text();
// Second fetch should be served from cache
const response2 = await fetch(url, { cache: 'default' });
assert_true(response2.ok, 'Second fetch should succeed');
const text2 = await response2.text();
assert_not_equals(text1, text2, 'Responses should be different, indicating no cache use');
}, 'Response with Cache-Control: max-age=2592000, public and Pragma: no-cache should not be cached');
promise_test(async _t => {
// Cache-Control: immutable should be cached even when Pragma: no-cache is present
// because immutable is a strong directive indicating the resource will never change.
const url = 'resources/cached_pragma_immutable_rand.py'
// First fetch to populate the cache
const response1 = await fetch(url, { cache: 'default' });
assert_true(response1.ok, 'First fetch should succeed');
const text1 = await response1.text();
// Second fetch should be served from cache
const response2 = await fetch(url, { cache: 'default' });
assert_true(response2.ok, 'Second fetch should succeed');
const text2 = await response2.text();
assert_equals(text1, text2, 'Responses should be identical, indicating cache use');
}, 'Response with Cache-Control: max-age=2592000, immutable and Pragma: no-cache should be cached');
</script>
</body>
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