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From "dave selby" <dave6...@googlemail.com>
Subject Re: [users@httpd] way for me to turn off if-modified-since & always return 304 reply ?
Date Fri, 12 Sep 2008 08:48:25 GMT
2008/9/12 André Warnier <aw@ice-sa.com>:
> Manik Taneja wrote:
>>
>> Nope, there is no way you can prevent the client from sending you an IMS
>> request.
>
> The above is correct, but if I understand the OP question correctly, the
> basic issue is to make sure that the client does not re-use a cached page,
> but always retrieves the latest page from the server.

Sorry, its me not explaining myself very clearly. Its the opposite.

If you look at kmotion v1 you will see why ....
http://code.google.com/p/kmotion/wiki/ScreenShots its more like an
application than a conventional web page. I have a directory that is
constantly updated with new images, because the directory is
constantly having its 'last modified' date changed apache keeps
resending images that do not need to be sent. And these are not small
files.

None of the images are ever changed, they each have a unique name and
are deleted by background daemons so once loaded I really don't want
to have to reload it again if for arguments sake I need to flip back
to the last frame.

kmotion v1 is alive and well but I am writting v2 & am trying to
improve responsiveness etc.

Sorry for the long explanation - but I hope this explains my problem.

> There is a whole array of things one can do on the server side, to at least
> try to achieve this. I don't recall all the specifics, but look for instance
> at HTTP headers such as "Cache-control".
> See here
> http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
> section 14.9
>
> The general idea is : the server, by a combination of HTTP headers sent
> along with the documents, and tags in the documents themselves, should be
> able to tell the client whether this page can, or cannot, be cached and
> re-used.
> And according to the HTTP specifications, the client (and any intermediate
> proxies) should obey these instructions.
>
> Now whether they always actually do, is anothet issue.
> (But in the practice I have noticed that they generally do).
>
> To modify the HTTP headers that Apache sends along with documents, you could
> use something like this :
> http://httpd.apache.org/docs/2.2/mod/mod_headers.html
> or mod_perl handlers.
>
>
> André
>
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>



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