Re: [orion-dev] 0.4m1 -> integration build and back

[John Arthorne <John_Arthorne@xxxxxxxxxx>]

Thanks for narrowing this down and finding
the webkit bug pointer John. We had come to a similar conclusion about
Ctrl+Shift+R ignoring dynamic content in the past, and found that cache
control headers fixed the problem for us. I wasn't sure if this was a bug
in Chrome, or just a case where Chrome decides that cache control headers
trump user reload requests (I know you asked for a refresh, but we know
better so we'll keep taking it from cache). We avoided this problem by
setting "Cache-Control: no-cache" on just about all dynamic content
coming from the Orion server. In this particular case the problem is that
we are caching plugin metadata in local storage, and we never even do an
xhr request to the server. Presumably Ctrl+Shift+R does not clear localStorage
so it doesn't help here. In some of our other localStorage we use our own
internal timestamp to expire our local cache and refetch from server periodically.
This internal cache expiry was just plain missing for plugin metadata.
Simon tracked this down yesterday but we neglected to update any bug. I
have updated this bug:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=366739

John

John J Barton <johnjbarton@xxxxxxxxxxxxxxx>
Sent by: orion-dev-bounces@xxxxxxxxxxx

01/25/2012 03:52 PM

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Subject	Re: [orion-dev] 0.4m1 -> integration build and back

Ok I was able to reproduce this problem by switching between
two versions of Orion. I was able to verify that Control+Shift+R does *not*
solve the problem, but Wrench > Tools > Clear browser cache since
beginning of time does solve the problem.

Then I hunted down our Chrome cache expert. The problem has two parts.
One is that Control+Shift+R does *not* force reload XHRs and two that XHRs
are not revalidated. 

Bug 30862 - Dynamically inserted subresources aren't revalidated even when
the containing document is reloaded
https://bugs.webkit.org/show_bug.cgi?id=30862

The only workarounds today seem to be :
  1) cache busting URLs: post pend a version number URLs so they mismatch
when the version changes.
  2) make the cache time magically correct so we flush based on time.

jjb

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