Bug 187726

Summary:

Web Inspector: Disable Cache doesn't affect preloaded content

Product:

WebKit

Reporter:

Martin Häcker <spamfaenger>

Component:

Web Inspector

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

bburg, ggaren, hello, inspector-bugzilla-changes, koivisto, oliverjash, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari Technology Preview

Hardware:

All

OS:

All

Attachments:

Description	Flags
screenshot	none
code and video of reproduction	none

Martin Häcker

Reported 2018-07-17 04:58:29 PDT

Created attachment 345151 [details] screenshot I've just noticed that `<link rel=preload ...>` content seems to completely ignore the 'disable cache' button in the webkit inspector. This has the effect that on my development system I frequently get out of date data when working with javascript. Which is quite annoying. See attached screenshot for an illustration of the problem.

Attachments
screenshot (121.89 KB, image/png) 2018-07-17 04:58 PDT, Martin Häcker	no flags	Details
code and video of reproduction (4.95 MB, application/zip) 2018-07-17 12:06 PDT, Martin Häcker	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Martin Häcker

Comment 1 2018-07-17 05:00:03 PDT

What I have in the html to load the script is this: `<link rel="preload" as="script" href="/static/additional.js" />` as well as `<script src="/static/additional.js"></script>`

Blaze Burg

Comment 2 2018-07-17 08:38:26 PDT

Are you able to reproduce this in a standalone test case? That would really help us to isolate and fix the issue.

Radar WebKit Bug Importer

Comment 3 2018-07-17 08:40:11 PDT

<rdar://problem/42286512>

Martin Häcker

Comment 4 2018-07-17 12:06:32 PDT

Created attachment 345179 [details] code and video of reproduction

Martin Häcker

Comment 5 2018-10-16 02:05:43 PDT

Hello @maintainers: any progress on this? This is _mightiliy_ annoying when trying to develop with Safari on a page that uses preloaded content. As far as I can tell neither Firefox nor Chromium behave this way, so I would be very surprised if this works as intended. Also, does my reproducer work for you? Do you need more input?

Martin Häcker

Comment 6 2018-10-16 02:10:50 PDT

Some more info I can add from my testing: If a page preloaded a script it seems * I can not reload any other page from the same site to get a new version of the script * Emptying the cache (command-alt-e) doesn't trigger a reload of the script * Force Reloading (command-alt-r) doesn't trigger a reload of the script. What we do: * We have an entry page that contains the preload statements * all other pages just reference the scripts as usual

Oliver Joseph Ash

Comment 7 2019-01-17 05:33:55 PST

I opened a new issue for this: https://bugs.webkit.org/show_bug.cgi?id=193533, as the bug is not specific to the "Disable Cache" feature in the web inspector. If a request is preloaded, Safari will always retrieve it from the cache, regardless of the cache headers for that request.

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