| Re: Using the browser's Webcache [message #175080 is a reply to message #175071] |
Thu, 11 August 2011 08:54   |
Luke
Messages: 10
Registered: June 2011
Karma:
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Junior Member |
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On Aug 10, 12:57 pm, Jerry Stuckle <jstuck...@attglobal.net> wrote:
> 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.
> jstuck...@attglobal.net
> ==================
Hi Jerry,
look at the link I posted (only the section "Use
>> PHP to force a conditional GET") — I'm sending a 304 header. Anyway, the browser says it get's a status-code 200. That's what I don't get. The point why I'm sending those headers manually is because in this particular case I'm generating an image and redirect to it (with a location-header). But if the User already has that image in it's cache, I just wanna send a 304, so that there's no redirect and thus less requests.
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