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Posted to users@httpd.apache.org by Roger <cr...@cox.net> on 2004/10/17 21:24:20 UTC
[users@httpd] Stuck trying to mod_disk_cache local cgi content
Hi,
I have a python cgi application which modifies .jpg files on the fly. I
am trying to implement disk caching for these images. I am running
Windows/XP with Apache 2.0.52.
The html pages created refer to the images as if they were .jpg images
and I use a rewrite rule to transform the request into a cgi get
request. So my first change was to just change the rewrite rule to force
a proxy request:
RewriteRule (^/dra/DRA_.*)___(.*)_(.*)(\.jpg$)
http://mysite.org/webkit/dra/ShowPix\?pid=$2\&tn=$3 [P,L]
(The original purpose of the above rule was to provide a pretty default
file name should the user right-click and do a save as.)
Per the docs, I loaded the modules and created the proxy and disk
caching statements:
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule cache_module modules/mod_cache.so
ProxyRequests Off
<ProxyMatch .*>
Order deny,allow
Allow from all
</ProxyMatch>
LoadModule disk_cache_module modules/mod_disk_cache.so
CacheRoot c:/ApacheCache
CacheSize 1000000
CacheEnable disk /
CacheDirLevels 5
CacheDirLength 3
The result of the above is that Apache is caching some local .css, and
.js files but is not caching the .jpg files covered by the rewrite rule.
I plan on turning off the .css and .js caching with the proxymatch
directive later.
The script creating the .jpg images puts out headers for
('cache-control','max-age=3600') and the browsers I am testing with (IE,
Mozilla, Opera) all cache the images successfully. So everything appears
to be working OK except the .jpg files are not cached by Apache.
Anyone have a clue as to what I am doing wrong?
Roger
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Re: [users@httpd] Stuck trying to mod_disk_cache local cgi content
Posted by Roger <cr...@cox.net>.
Robert Andersson wrote:
> Roger wrote:
>
>> The result of the above is that Apache is caching some local .css,
>> and .js files but is not caching the .jpg files covered by the
>> rewrite rule. I plan on turning off the .css and .js caching with the
>> proxymatch directive later.
>>
>> The script creating the .jpg images puts out headers for
>> ('cache-control','max-age=3600') and the browsers I am testing with
>> (IE, Mozilla, Opera) all cache the images successfully. So everything
>> appears to be working OK except the .jpg files are not cached by Apache.
>
>
> Are you setting the "Last-modified" header when generating the images?
> It might help. Most caches requires it, although I don't know about
> the module.
>
> Regards,
> Robert Andersson
>
No, I was not. I added Last-Modified headers, then Date headers, and
finally threw in public and s-maxage into Cache-Control for good measure
after the addition of Last-Modified had no effect. But the results
remain the same.
After reading the rewriterule doc a second time, I concluded the [P]
flag was only meant for caching data from external sites and is not
needed for locally generated data.
I noticed there is another thread that says disk caching does not work
on 2.0.52, but did work on 2.050. I moved from 2.0.48 to 2.0.52 after I
encountered the problem. While the other thread indicates there is no
disk caching, I am seeing static .js and .css files and even some .jpg
logo files cached by Apache 2.0.52.
Roger
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Re: [users@httpd] Stuck trying to mod_disk_cache local cgi content
Posted by Robert Andersson <ro...@profundis.nu>.
Roger wrote:
> The result of the above is that Apache is caching some local .css, and .js
> files but is not caching the .jpg files covered by the rewrite rule. I
> plan on turning off the .css and .js caching with the proxymatch directive
> later.
>
> The script creating the .jpg images puts out headers for
> ('cache-control','max-age=3600') and the browsers I am testing with (IE,
> Mozilla, Opera) all cache the images successfully. So everything appears
> to be working OK except the .jpg files are not cached by Apache.
Are you setting the "Last-modified" header when generating the images? It
might help. Most caches requires it, although I don't know about the module.
Regards,
Robert Andersson
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