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Message-ID: <45EDEE18.5020004@cs.ubc.ca>
Date: Tue, 06 Mar 2007 14:41:28 -0800
From: Erica Zhang <ericazhj@cs.ubc.ca>
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To: modules-dev@httpd.apache.org
Subject: Re: Questions on modules to provide cache functions for Apache
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I use live http headers to catch the headers. I listed them below. Well 
I found that php file has not been given the http headers. So is this 
the problem for not caching the response produced by it ? Then how can I 
handle this problem ? Also, is there some mod_cache log that I could 
refer ? Thanks.

http://128.189.246.64/gethint.php?q=Eric&sid=0.11837499670287688

GET /gethint.php?q=Eric&sid=0.11837499670287688 HTTP/1.1
Host: 128.189.246.64
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2) 
Gecko/20070219 Firefox/2.0.0.2
Accept: 
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://128.189.246.64/

HTTP/1.x 200 OK
Date: Tue, 06 Mar 2007 22:35:34 GMT
Server: Apache/2.0.59 (Win32)
X-Powered-By: PHP/4.4.4
Cache-Control: public
Last-Modified: Tue, 06 Mar 2007 22:35:34 GMT
Keep-Alive: timeout=15, max=10000
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html


Erica Zhang wrote:

> Well, even I use the blinding-cache. It still could not work. Thanks,
>
> Erica
>
> David Wortham wrote:
>
>> Erica,
>>   I'm not sure why mod_cache should not be able to work (assuming your
>> module and pages are configured correctly).
>>
>>   IIRC, JavaScript is used on the presentation request (with the 
>> webpage),
>> whereas the XMLHttpRequest response is a PHP-generated XML document.
>> Perhaps your extension ('.php" maybe?) or the mime/content-type 
>> ("text/xml")
>> is what is causing mod_cache to skip the file?
>>
>>   Also, from what I can gather, using mod_cache with mod_proxy (as a
>> caching proxy) can alter the effects of mod_cache slightly.  You may 
>> want to
>> read up on that.
>>
>> Try using the following directive with mod_cache:
>> CacheIgnoreNoLastMod On
>>
>> see:
>> http://webauth.stanford.edu/manual/mod/mod_cache.html#CacheIgnoreNoLastMod 
>>
>>
>> This apparently forces blind-caching which Joe suggests is bad (I 
>> don't know
>> anything about it).  Short of that, you just need to read the mod_cache
>> manual and make sure your XML response contains the necessary headers 
>> to get
>> mod_cache to work correctly.
>>
>> Regards,
>> Dave
>>
>>
>>
>> On 3/6/07, Erica Zhang <ericazhj@cs.ubc.ca> wrote:
>>
>>>
>>> No, still not work. Infact, mod_cache could work, because it could 
>>> cache
>>> the javascript. But it could not work for dynamic HTTP responses
>>> responding to XMLHttpRequests in Ajax technology. So I suspect 
>>> mod_cache
>>> could not support this function. And I need provide such function by
>>> myself. I prefer to do it in Apache, a comparatively general way 
>>> instead
>>> of application itself.
>>>
>>>
>>> Erica
>>>
>>> Joachim Zobel wrote:
>>>
>>> >Am Montag, den 05.03.2007, 22:53 -0800 schrieb Erica Zhang:
>>> >
>>> >
>>> >>header("Cache-Control: public"); // HTTP/1.1
>>> >>header("Expires: " .gmdate ("D, d M Y H:i:s", time() + 60 * 10). "
>>> GMT");
>>> >>header( "Last-Modified: " .gmdate( 'D, d M Y H:i:s' ). " GMT" );
>>> >>echo $response;
>>> >>
>>> >>
>>> >
>>> >I am not shure about mod_caches behaviour, but omitting 
>>> last-modified is
>>> >worth a try.
>>> >
>>> >Sincerely,
>>> >Joachim
>>> >
>>> >
>>> >
>>>
>>>
>>