[thelist] A question on proxy caching.

[Adrian-Bogdan Andreias]

I think that the proxy wouldn't have how to know that it is the same file.
That has to work.

I thought about the method you're talking about a while ago, when I was 
having a similar problem, but
I was fixed with knees begging headers method, so I never give it a try.

Anyway, why won't you give that a try?
You can make a separate test, out of your application. Just write generate a 
bogus JS file out php (or
whatever language you're using) and write into a comment in JS file the URL 
how it was retrieved.
You should be able to have the results of this test in a few minutes..



On 5/9/05, VOLKAN ÖZÇELİK <volkan.ozcelik at gmail.com> wrote:
> 
> Hi evolters!
> 
> We're developing a site and some of our clients (ADSL users actually)
> showed that their js files are being cached. When we make a change it
> might take around 1 day for the changes to propagate to the client.
> 
> We've tried the usual tricks ctrl+R, ctrl+f5, type the url of the js
> file to the address bar and then ctrl+f5, adding pragma no cache and
> several other browser specific "please don't cache me, I beg on my
> knees" headers.
> None of them worked :(
> 
> My intelligent guess is that not the client's browser but TurkTelecom
> (the ADSL provider) is caching the files to reduce network traffic.
> 
> After this much introduction, here is my question?
> 
> say my js file is included like
> 
> <script type="text/javascript" src="pathtomyfile/myfile.js"></script>
> 
> Can appending a random generated query string will deceive the ISP and
> prevent the file from being cached? I mean:
> 
> <script type="text/javascript"
> src="pathtomyfile/myfile.js?rand=1231.2323xys"></script>
> 
> given that rand changes at each request, will the proxy server send
> the fresh file, instead of providing the cached one.
> 
> Or can the ISP proxy be"clever-enough" to detect that the two HTTP
> requests (with and without the appended query string) refer to the
> same file and provide the cached version of the file in either
> situation?
> 
> This cache issue is causing a lot of headache, and when the usage of
> the system spreads more, things will be much worse. We are updating
> the system/scripts etc approximately thrice a week. So caching is an
> important issue.
> 
> I hear you saying "don't bother us, just try and see". But it is at
> least 1-day work. (not all the files cached, and it appears that the
> files are cached at random, so it will be a project-wide
> implementation) So if it will definetely not work, I'd be glad to
> learn before I begin. Similarly if it will definetely solve the
> problem, I will be rushing to implement it.
> 
> Thank you very much in advance,
> Volkan.
> --
> 
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-- 
Adi - http://www.designtutorials.info