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Groups > comp.lang.java.programmer > #28514

Re: invalidating caches

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Sarah Connor wrote:

> > One useful tip I learned from that tutorial is a server can effectively
> > invalidate caches by renaming a document or image.  The client will have
> > to fetch afresh even if the original had a long time to live.
>
> That has the nasty side effect of breaking existing bookmarks and links
> though.

But, on the other hand, the link to the old version remains separate from the 
link to the "latest" version which can be a good thing.

Nothing to stop a server having several links.  One which always redirects to 
the latest, and others which point to specific versions.  Note that provided 
the redirect is done at HTTP level (or equivalent) then the client and 
intermediates can still cache correctly.

Or poor man's cache control: have a query parameter in the URL which the server 
always ignores, but which code on the client (presumably JavaScript in the 
typical case) sets to a fresh value on each fetch.

    -- chris 

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Thread

invalidating caches Roedy Green <see_website@mindprod.com.invalid> - 2014-05-15 02:26 -0700
  Re: invalidating caches leif.roar@invalid.com (Leif Roar Moldskred) - 2014-05-15 04:56 -0500
  Re: invalidating caches Jeff Higgins <jeff@invalid.invalid> - 2014-05-15 16:36 -0400
    Re: invalidating caches Roedy Green <see_website@mindprod.com.invalid> - 2014-05-16 01:58 -0700
      Re: invalidating caches Sarah Connor <s.connor@gmail.invalid> - 2014-05-16 10:31 +0000
        Re: invalidating caches "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-05-17 11:06 +0100

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