| <!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> |
