Bug 194589

Summary:

Inserting <link rel=preload via script results in duplicate downloads

Product:

WebKit

Reporter:

Andy Davies <ad>

Component:

Page Loading

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

beidson, gaurav5430, jakub.g.opensource, webkit-bug-importer, yoav

Priority:

Keywords:

InRadar

Version:

Safari Technology Preview

Hardware:

Mac

OS:

macOS 10.14

See Also:

https://bugs.webkit.org/show_bug.cgi?id=250454

Attachments:

Description	Flags
Console showing resource timing entries	none
Safari Waterfall showing double downloads	none
Server log confirming duplicate requests	none

Andy Davies

Reported 2019-02-13 05:10:48 PST

Created attachment 361912 [details] Console showing resource timing entries https://andydavies.github.io/test-rel-preload/tests/electro/index-js-inserted-link-preload-v2.html has a script block that injects <link rel=preload elements for four fonts When the page is loaded in Safari, frequently (but not always) each script is downloaded twice - see the attached Inspector screenshot The double downloads don't appear in the Resource Timing entries for the page, with there only being one entry per font Viewing the server logs (with the same page on a different server) shows the fonts were downloaded twice

Attachments
Console showing resource timing entries (1.34 MB, image/png) 2019-02-13 05:10 PST, Andy Davies	no flags	Details
Safari Waterfall showing double downloads (1006.42 KB, image/png) 2019-02-13 05:11 PST, Andy Davies	no flags	Details
Server log confirming duplicate requests (19.31 KB, text/plain) 2019-02-13 05:12 PST, Andy Davies	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Andy Davies

Comment 1 2019-02-13 05:11:36 PST

Created attachment 361913 [details] Safari Waterfall showing double downloads

Andy Davies

Comment 2 2019-02-13 05:12:16 PST

Created attachment 361914 [details] Server log confirming duplicate requests

Radar WebKit Bug Importer

Comment 3 2019-02-14 11:17:02 PST

<rdar://problem/48080759>

gaurav5430

Comment 4 2021-09-20 19:28:59 PDT

I am facing a similar issue where preloaded fonts are being downloaded twice. In my case though, it is once downloaded from preload and then downloaded from css font face. As for not showing up in resource timing, I do face a similar issue where the css font face download is only shown for the first time and once cached, does not appear in the font network tab anymore in subsequent requests I also get the "not used within 3 seconds" message

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