| Re: Using the browser's Webcache [message #175071 is a reply to message #175070] |
Wed, 10 August 2011 10:57   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 8/10/2011 5:50 AM, Luke wrote:
> Hi,
>
> I'm trying to utilize the browser's Webcache with php. I have a
> timestamp of the time when my site has been changed and I'm trying to
> send a "304 Not Modified" if the user already has my page in his
> cache. I'm using the function described on this page [1] under "Use
> PHP to force a conditional GET". I also added the headers
>
> header("Cache-Control: public");
> header("Expires: Thu, 15 Apr 2012 20:00:00 GMT");
> header("Pragma: cache");
>
> but the page gets reloaded every time. These are the headers from the
> server:
>
> Status-Code:200 OK
> Cache-Control:public
> Connection:Keep-Alive
> Date:Wed, 10 Aug 2011 08:20:44 GMT
> Etag:"b393df7221a36ce8e02e96c7df308a16"
> Expires:Thu, 15 Apr 2012 20:00:00 GMT
> Keep-Alive:timeout=15, max=99
> Last-Modified:Wed, 10 Aug 2011 07:50:04 GMT
> Pragma:cache
>
> I really can't figure out what the problem is.
>
> Greetings from Germany
> Lukas
>
> [1] http://www.askapache.com/php/speed-up-sites-with-php-caching.html
First of all, I don't see a 304 in your headers. But the bottom line is
you can't force a 304 - it's up to the browser to make a conditional
request (HTTP_IF_MODIFIED_SINCE).
But then it's generally not necessary to do it in PHP anyway - the web
server will handle it.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================
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