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Groups > comp.lang.java.programmer > #28483

invalidating caches

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This is more a question about Internet protocols than Java.

I am first off the blocks to download new versions of software.  I
often find when I get there, only the old version is still posted.

I understand sometimes the new version has not had time to propagate
to all the mirrors, but I also suspect the old version might be stuck
in an intermediate cache somewhere. Sometimes the site will toggle
between two versions.

I read about this some time ago, and I understood that items in a
cache had a time to live.

What I wondered is, does the server have a way of broadcasting a cache
invalidate to ensure the new version is seen immediately?

If so, can you do it from Java?

The server in theory would know all the end-user IPS who had requested
the page recently, but I don't think caches let the server know what
they are up to.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
Young man, in mathematics you don’t understand things.
You just get used to them. 
~ John von Neumann (born: 1903-12-28 died: 1957-02-08 at age: 53)

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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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