238564 2022-03-30 11:53:00 -0700 Service-Worker-Navigation-Preload header not being sent when Navigation Preload is enabled. 2022-04-04 10:34:26 -0700 1 1 1 Unclassified WebKit Service Workers Safari 15 Mac (Intel) macOS 12 RESOLVED FIXED InRadar P2 Normal --- 1 jlwagner youennf achristensen simon.fraser webkit-bug-importer webkit youennf oldest_to_newest 1856508 0 jlwagner 2022-03-30 11:53:00 -0700 Overview: I'm currently working on a Workbox-powered service worker for my personal website that uses streams to precache header and footer markup and combine those precached bits of markup with content partials provided by a PHP back end for faster loading performance. I'm using Navigation Preload in this mix, and have noted that the Service-Worker-Navigation-Preload header (https://developer.mozilla.org/docs/Web/HTTP/Headers/Service-Worker-Navigation-Preload) is not being sent. This header is important for application back ends because, at least in the context of streaming partial responses, it's important to have a signal from the client that lets us know if we need to send partial content. This is where the Service-Worker-Navigation-Preload test header comes in, and it appears that Safari 15.4 (and release 142 of Safari Technical Preview) are not sending this header when Navigation Preload is enabled. Steps to reproduce: 1. Open Safari 15.4 2. Go to Developer > Experimental Features and ensure "Service Worker Navigation Preload" is enabled. 2a. If "Service Worker Navigation Preload" is not enabled, enable it and then restart Safari. 3. Navigate to https://jlwagner.net/ 4. Click on the "contact" link to go to a page where the service worker will control it. There should be two instances of the site header and footer. 5. Navigate to https://jlwagner.net/request-headers.php to view response headers. 6. There should be a list item consisting of "HTTP_SERVICE_WORKER_NAVIGATION_PRELOAD: true", but it will not appear as the header is not being sent. 7. Open a recent version of Chrome, and repeat steps 1-4. Note that there is only one header and one footer. 8. Navigate to https://jlwagner.net/request-headers.php to view response headers. 9. Note that a list item consisting of "HTTP_SERVICE_WORKER_NAVIGATION_PRELOAD: true" is present. Expected results: The Service-Worker-Navigation-Preload header is not being sent when Navigation Preload is enabled. Actual results: The Service-Worker-Navigation-Preload header should be sent when Navigation Preload is enabled. Build Date & Hardware: Safari Version 15.4 (17613.1.17.1.6) on macOS 12.3 (Intel) Additional information: Web Platform Test for the header shows a failure for Safari Technical Preview: https://wpt.fyi/results/service-workers/service-worker/navigation-preload/request-headers.https.html?label=experimental&label=master&aligned 1857805 1 456555 youennf 2022-04-04 03:52:06 -0700 Created attachment 456555 Patch 1857892 2 456555 youennf 2022-04-04 09:45:30 -0700 Comment on attachment 456555 Patch iOS w2 failure is unrelated 1857922 3 ews-feeder 2022-04-04 10:33:05 -0700 Committed r292296 (249194@main): <https://commits.webkit.org/249194@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 456555. 1857925 4 webkit-bug-importer 2022-04-04 10:34:26 -0700 <rdar://problem/91248490> 456555 2022-04-04 03:52:06 -0700 2022-04-04 10:33:07 -0700 Patch bug-238564-20220404125205.patch text/plain 7689 youennf U3VidmVyc2lvbiBSZXZpc2lvbjogMjkyMjc4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDQ1ZWQ2OTk2NjBkZDAyMThl MTNhY2UxOGVjMjM4Y2RiNmZhMzg4NGYuLjVlMmMyN2U2YWFjMTYwNTI5NzY0YzZlN2NlZDdlMzcz OGI1ZDlmM2MgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTggQEAKKzIwMjItMDQtMDQgIFlvdWVubiBG YWJsZXQgIDx5b3Vlbm5AYXBwbGUuY29tPgorCisgICAgICAgIFNlcnZpY2UtV29ya2VyLU5hdmln YXRpb24tUHJlbG9hZCBoZWFkZXIgbm90IGJlaW5nIHNlbnQgd2hlbiBOYXZpZ2F0aW9uIFByZWxv YWQgaXMgZW5hYmxlZC4KKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcu Y2dpP2lkPTIzODU2NAorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisg 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