Re: an idea

Stephanos Piperoglou (
Sun, 22 Sep 1996 17:48:00 +0300 (EET DST)

Date: Sun, 22 Sep 1996 17:48:00 +0300 (EET DST)
From: Stephanos Piperoglou <>
To: Volker Kroll <>
Subject: Re: an idea
In-Reply-To: <>
Message-ID: <>

On Sun, 22 Sep 1996, Volker Kroll wrote:

> > I'm not a http/html guru, so please excuse me if something like this
> > already exists, or has been proposed, or is just stupid...
> > anyway, it seems netscape & mie always download images (or the whole
> > document) even if it's unchanged..  couldn't a CRC type thing be used,
> > where the client is told the CRC of the file and can use that to
> > determine if it needs to GET it..
> > ie, the server could insert a CRC tag 
> > <img src="" crc=ff31cd5f >
> > and if the browser has ANY file in cache with that CRC it can skip it
> > 
> > 
> I think this might be a good idea. Many technical WWW sites uses the same graphics i.e. for ActiveX Controls or the button for "Netscape now" a you have to download it every time. But there might be the problem, that everyone has to use the new tag.
> By now not everyone uses tags like alt in formatting images and so its hard to imagine that all the webauthors will use this new tag.

This is not an HTML issue ; it is an HTTP issue. A CRC HTTP header would be
a nice idea, since most "Verifying" of cached documents today relies on
matching HTTP headers EXACTLY (last modified date, content length etc... if
any of these vary, the document is refreshed).

 If my opinions were my employers', they'd be pretty wierd opinions.
         Stephanos Piperoglou <*> 
"I want peace on earth and good will toward man"
"We're the United States Government, we don't do that sort of thing!"
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