Hey everyone,
I'm having some real trouble getting mod_cache working correctly. I'm
using mod_rewrite and PHP too. I have my document:
http://www.chickensmoothie.com/pet/1067395&bg=F1E9C8.jpg
My cache is set up like this:
CacheEnable disk /pet
In /pet/.htaccess I have this:
RewriteEngine on
RewriteBase /
RewriteRule ^(.*)\.jpg$ /pet.php?id=$1
/pet.php sends an ETag when it generates the document. If it gets a
"If-None-Match" request header, it sends a "HTTP/1.0 304 Not Modified"
response code, along with a custom header "X-CS-Caught-Late: yes" and
exits. Otherwise, it sends a 200 code, a timestamp indicating when the
document was generated (X-CS-Generated) along with the document.
What I expect will happen is that with the very first GET of the
document, it will not be found in the disk cache. The request will be
passed on to my pet.php script which will send the response along with
an ETag. This works perfectly (IE7). Here's the request:
GET /pet/1067395&bg=F1E9C8.jpg HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/x-ms-application, application/vnd.ms-xpsdocument,
application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel,
application/vnd.ms-powerpoint, application/msword,
application/x-silverlight, application/x-shockwave-flash, */*
Accept-Language: en-nz
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64;
SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30618)
Host: www.chickensmoothie.com
Connection: Keep-Alive
The server's response:
HTTP/1.1 200 OK
Date: Fri, 24 Apr 2009 05:33:36 GMT
Server: Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.5 with Suhosin-Patch
X-Powered-By: PHP/5.2.4-2ubuntu5.5
Cache-Control: max-age=7000, public
ETag: "ad7401c3ef76ef0532c687209f075abb"
X-CS-Generated: Fri, 24 Apr 2009 05:33:37 +0000
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: image/png
<document was sent here>
Now on the second request from IE, it correctly sends a conditional get
with the ETag:
GET /pet/1067395&bg=F1E9C8.jpg HTTP/1.1
Accept: */*
Accept-Language: en-nz
Accept-Encoding: gzip, deflate
If-None-Match: "ad7401c3ef76ef0532c687209f075abb"
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64;
SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30618)
Host: www.chickensmoothie.com
Connection: Keep-Alive
And the server gives the correct _headers_ back:
HTTP/1.0 304 Not Modified
Date: Fri, 24 Apr 2009 05:33:41 GMT
Server: Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.5 with Suhosin-Patch
Connection: close
ETag: "ad7401c3ef76ef0532c687209f075abb"
Cache-Control: max-age=7000, public
<document was sent here>
But Apache sends the document at the end of the 304 Not Modified
response! This sort of defeats the purpose of this response code. You
can see that the response is not generated by my backend code, because
the custom header "X-CS-Caught-Late: yes" is not in the response.
Why is this happening? You can try it out on my live server, using the
same URL as I did.
Cheers,
Nicholas Sherlock
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