Re: graphics cached by browser

Thanks, everyone, for all the great ideas and resources. I asked my
question and the answers just started pouring in. This is a great list!
-Susan

At 12:21 PM 12/15/2003 -0800, you wrote:
>At 10:39 -0800 2003-12-15, Susan L. Hedgpeth wrote:
>>We just changed some graphics on our homepage. Some people's browsers
>>are displaying combinations of the old and the new (which looks very
>>bad). ... What do we do to make sure users are seeing the most updated
>>graphics?
>
>At 11:32 -0800 2003-12-15, Milan Andric wrote:
>>I think that's [reload page in browser, perhaps also delete the local
>>browser cache] about all you can do. Not sure if you already did, but
>>try a different browser like mozilla to compare, and isolate the issue.
>>Are you using a proxy by chance? I'm thinking something else might be
>>caching it along the way, besides the browser.
>
>At 12:00 -0800 2003-12-15, Graham A. Patterson wrote:
>>The only way to avoid mixed graphics because of local browser caching is
>>to ensure that the name of the graphic file is changed when the content
>>of it changes. ... Then the browser treats the files as new, irrespective
>>of local caching.
>
> Good suggestions. To add to this discussion, one article summarizing
> these issues is:
>
> http://www.netmechanic.com/news/vol4/design_no5.htm
>
> The above article links to a second, highly detailed article on caching
> of web content, and how to control it:
>
> http://wdvl.com/Internet/Cache/index.html
>
> This article suggests that setting a <meta http-equiv="expires" ...>
> tag on the relevant Web pages may help keep most Web browsers from
> caching data on those pages -- so this technique will help somewhat --
> but won't work with most proxy servers.
>
> Setting the "Expires:" HTTP header at the server apparently should work
> with both browsers and proxies, however. And a new category of
> Cache-Control headers in HTTP 1.1 allows finer control of what can be
> cached and what should not be.
>
> Graham's suggestion seems by far the most straightforward for Susan's
> situation. However, if anyone might need to delve further into browser
> and proxy caching behavior, the above articles might serve as a good
> starting point. The latter includes some good references and tools, at
> <http://wdvl.com/Internet/Cache/ref.html#REF>.
>
>Aron Roberts
>Workstation Software Support Group
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------------------------------------------------
Susan Hedgpeth
Web Coordinator
Career Center, University of California, Berkeley
2111 Bancroft Way #4350, Berkeley, CA 94720-4350
phone: (510) 642-8093 - fax: (510) 643-6120
email: hedgpeth_at_uclink.berkeley.edu - website: http://career.berkeley.edu

Dennis Kucinich for President
http://www.kucinich.us

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Received on Mon Dec 15 13:30:09 2003