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Re: Please evaluate my cache-control & pragma etc. code [message #182527 is a reply to message #182522]

Sat, 10 August 2013 17:21

bill
Messages: 310
Registered: October 2010

Karma:

Senior Member

On 2013-08-10 4:49 AM, The Natural Philosopher wrote:
> On 09/08/13 19:22, Twayne wrote:
....
>> <?php
>> session_start();
>> header('Cache-Control: no-cache, no-store, must-revalidate'); //HTTP/1.1
>> header('Expires: Sun, 01 Jul 2005 00:00:00 GMT');
>> header('Pragma: no-cache'); //HTTP/1.0

....

> my limited experience suggests that browser caching is more affected by
> the etag.
> I have been writing a framework that serves all pages /objects from a
> database ( for reasons of security and control), and found that in
> general browsers don't really honor cache control, but they do honor etags.
> I think proxies tend to honor cxahche control more.
>
> The browsers tend to say 'ive got a copy, do I need a new one?' and
> actually ask, using the etag.
>
> I found that out looking at my log files on pages with multiple images
> under constant rerfreshing. The logs were full of 304 responses, but
> there were always as many of those as the page had images for a given
> page load.
>
> The code that checks the etag is here - it really does reduce server
> load if you want to not resend data that's already been sent
>
> // check if etag matches if none match request headers
> function check_etag($etag)
> {
> if(isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
> strstr($_SERVER['HTTP_IF_NONE_MATCH'],$etag))
> {
> header('HTTP/1.0 304 Not Modified');
> exit();
> }
> }
> This is a handy way to encourage browsers not to re-download static pages.
>

Which is precisely what I want to do, actually. I'll look into that a
bit further and try it! Thanks much for the alternative.

Best regards,

Twayne`

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[Message index]

		Please evaluate my cache-control & pragma etc. code By: bill on Fri, 09 August 2013 18:22
		Re: Please evaluate my cache-control & pragma etc. code By: J.O. Aho on Fri, 09 August 2013 20:57
		Re: Please evaluate my cache-control & pragma etc. code By: bill on Fri, 09 August 2013 23:12
		Re: Please evaluate my cache-control & pragma etc. code By: The Natural Philosoph on Sat, 10 August 2013 08:49
		Re: Please evaluate my cache-control & pragma etc. code By: bill on Sat, 10 August 2013 17:21
		Re: Please evaluate my cache-control & pragma etc. code By: Fiver on Sat, 10 August 2013 15:19
		Re: Please evaluate my cache-control & pragma etc. code By: bill on Sat, 10 August 2013 17:17

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