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Posted to bugs@httpd.apache.org by bu...@apache.org on 2006/07/21 22:16:37 UTC
DO NOT REPLY [Bug 40090] New: - mod_deflate/mod_mem_cache issues
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Summary: mod_deflate/mod_mem_cache issues
Product: Apache httpd-2
Version: 2.2.2
Platform: PC
OS/Version: Linux
Status: NEW
Severity: major
Priority: P2
Component: mod_cache
AssignedTo: bugs@httpd.apache.org
ReportedBy: apacheuser123@hotmail.com
I didn't see "mod_mem_cache" in the Component field so assigning this to mod_cache.
I have an Apache 2.2.2 setup on a Redhat box. Mod_proxy(mod_proxy_ajp) is being
used to connect to tomcat on the same machine. Caching is implemented using
mod_cache(mod_mem_cache). This setup works fine and caching seems to be working
as expected.
The problem occurs when I try to optimize further by supporting HTML compression
using mod_deflate. In this case, whenever deflated documents are served by the
cache the Content-length returned is 0. Is this a known issue ? Can mod_deflate
and mod_mem_cache be used together ? Or is it that mod_mem_cache cannot handle
compressed content ?
Here's the output from lwp-request( the second one shows the serving up of
cached content)
[root@bin]# lwp-request -uedsx http://localhost:80/Main.do -H
Accept-Encoding:gzip,deflate
LWP::UserAgent::new: ()
LWP::UserAgent::request: ()
LWP::UserAgent::send_request: GET http://localhost:80/Main.do
LWP::UserAgent::_need_proxy: Not proxied
LWP::Protocol::http::request: ()
LWP::Protocol::collect: read 670 bytes
LWP::Protocol::collect: read 4096 bytes
LWP::Protocol::collect: read 3002 bytes
LWP::UserAgent::request: Simple response: OK
GET http://localhost:80/Main.do
200 OK
Cache-Control: no-store, must-revalidate, post-check=0, pre-check=0
Connection: close
Date: Tue, 18 Jul 2006 18:27:35 GMT
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 7768
Content-Type: text/html;charset=ISO-8859-1
Expires: Tue, 18 Jul 2006 18:30:37 GMT
Last-Modified: Tue, 18 Jul 2006 18:27:37 GMT
Client-Date: Tue, 18 Jul 2006 18:27:37 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
[root@bin]# lwp-request -uedsx http://localhost:80/Main.do -H
Accept-Encoding:gzip,deflate
LWP::UserAgent::new: ()
LWP::UserAgent::request: ()
LWP::UserAgent::send_request: GET http://localhost:80/Main.do
LWP::UserAgent::_need_proxy: Not proxied
LWP::Protocol::http::request: ()
LWP::UserAgent::request: Simple response: OK
GET http://localhost:80/Main.do
200 OK
Cache-Control: no-store, must-revalidate, post-check=0, pre-check=0
Connection: close
Date: Tue, 18 Jul 2006 18:28:32 GMT
Age: 56
Server: Apache/2.2.2 (Unix)
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 0
Content-Type: text/html;charset=ISO-8859-1
Expires: Tue, 18 Jul 2006 18:30:37 GMT
Last-Modified: Tue, 18 Jul 2006 18:27:37 GMT
Client-Date: Tue, 18 Jul 2006 18:28:32 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
Here's the deflate.log contents
"GET /Main.do HTTP/1.1" 7750/35169 (22%)
"GET /Main.do HTTP/1.1" -/- (-%)
Relevant sections of my httpd.conf:
LoadModule cache_module modules/mod_cache.so
LoadModule mem_cache_module modules/mod_mem_cache.so
LoadModule deflate_module modules/mod_deflate.so
LoadModule expires_module modules/mod_expires.so
LoadModule headers_module modules/mod_headers.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
#
# mod_expires settings
#
<IfModule expires_module>
ExpiresActive On
ExpiresByType text/css "access plus 1 day"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
</IfModule>
#
# mod_proxy/mod_proxy ajp settings
#
<IfModule proxy_module>
ProxyRequests Off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPass /favicon.ico !
ProxyPass / ajp://localhost:8009/
ProxyPassReverse / ajp://localhost:8009/
</IfModule>
#
# mod_cache/mod_mem_cache settings
#
<IfModule cache_module>
<IfModule mem_cache_module>
CacheEnable mem /
CacheStoreNoStore On
# CacheIgnoreCacheControl On
# CacheIgnoreNoLastMod On
# CacheMaxExpire 150
MCacheSize 4096
MCacheMaxObjectCount 200
MCacheMinObjectSize 1
MCacheMaxObjectSize 524288
</IfModule>
</IfModule>
#
# Worker MPM settings
#
<IfModule mpm_worker_module>
StartServers 1
MaxClients 250
ThreadsPerChild 50
MinSpareThreads 25
MaxSpareThreads 75
</IfModule>
<IfModule deflate_module>
SetOutputFilter DEFLATE
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|rar|zip)$ no-gzip
DeflateFilterNote Input instream
DeflateFilterNote Output outstream
DeflateFilterNote Ratio ratio
LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate
CustomLog logs/deflate.log deflate
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
<IfModule headers_module>
Header append Vary User-Agent
</IfModule>
</IfModule>
I posted this issue in the user support list. As suggested there, I configured
apache to use mod_disk_cache and it seems to be working and compressed content
is getting served up correctly. So I am guessing that this means it is a bug in
mod_mem_cache.
Please let me know if you need more information.
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DO NOT REPLY [Bug 40090] - mod_deflate/mod_mem_cache issues
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------- Additional Comments From rpluem@apache.org 2006-07-25 21:46 -------
mod_mem_cache cannot handle varied content correctly and a fix will require
bigger changes. Thus I leave this report open. In the meantime you can fall back
to mod_disk_cache which can handle varied content properly. Regarding possible
performance thoughts: In most cases mod_disk_cache is as fast as mod_mem_cache,
in some cases it is even faster.
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DO NOT REPLY [Bug 40090] - mod_deflate/mod_mem_cache issues
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------- Additional Comments From rpluem@apache.org 2006-07-26 17:34 -------
Committed patch to trunk as r425787
(http://svn.apache.org/viewvc?rev=425787&view=rev).
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DO NOT REPLY [Bug 40090] - mod_deflate/mod_mem_cache issues
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------- Additional Comments From chip@force-elite.com 2006-07-21 20:45 -------
If you want this to work, try using mod_disk_cache, which is known to be working
correctly with mod_deflate.
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------- Additional Comments From apacheuser123@hotmail.com 2006-07-25 19:06 -------
Ruediger Pluem, Thank you very much for the fix. Sorry I couldn't test your
patch before today. Anyways, I applied the patch and ran some tests. It seems to
have fixed the issue that was reported.
But, I noticed another problem. Here's what's happening...
#############
First Request ( Works fine-Caches the compressed content correctly )
#############
[root@local]# lwp-request -uedsx http://localhost:80/Main.do -H
Accept-Encoding:gzip,deflate
LWP::UserAgent::new: ()
LWP::UserAgent::request: ()
LWP::UserAgent::send_request: GET http://localhost:80/Main.do
LWP::UserAgent::_need_proxy: Not proxied
LWP::Protocol::http::request: ()
LWP::Protocol::collect: read 670 bytes
LWP::Protocol::collect: read 4096 bytes
LWP::Protocol::collect: read 2836 bytes
LWP::UserAgent::request: Simple response: OK
GET http://localhost:80/Main.do
200 OK
Cache-Control: no-store, must-revalidate, post-check=0, pre-check=0
Connection: close
Date: Tue, 25 Jul 2006 18:42:12 GMT
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 7602
Content-Type: text/html;charset=ISO-8859-1
Expires: Tue, 25 Jul 2006 18:45:13 GMT
Last-Modified: Tue, 25 Jul 2006 18:42:13 GMT
Client-Date: Tue, 25 Jul 2006 18:42:13 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
error_log
#########
[Tue Jul 25 11:42:12 2006] [debug] mod_cache.c(131): Adding CACHE_SAVE
filter for /Main.do
[Tue Jul 25 11:42:12 2006] [debug] mod_cache.c(138): Adding CACHE_REMOVE_URL
filter for /Main.do
***snip fetches data correctly***
[Tue Jul 25 11:42:13 2006] [debug] mod_deflate.c(447): [client 127.0.0.1] Zlib:
Compressed 35547 to 7584 : URL /Main.do
[Tue Jul 25 11:42:13 2006] [debug] mod_headers.c(612): headers:
ap_headers_output_filter()
[Tue Jul 25 11:42:13 2006] [debug] mod_cache.c(621): cache: Caching url: /Main.do
[Tue Jul 25 11:42:13 2006] [debug] mod_cache.c(627): cache: Removing
CACHE_REMOVE_URL filter.
[Tue Jul 25 11:42:13 2006] [debug] mod_cache.c(670): cache: Added date header
[Tue Jul 25 11:42:13 2006] [info] mem_cache: Cached url:
http://localhost:80/Main.do?
###############
Second Request ( Works fine-Fetches compressed content from cache )
##############
[root@local]# lwp-request -uedsx http://localhost:80/Main.do -H
Accept-Encoding:gzip,deflate
LWP::UserAgent::new: ()
LWP::UserAgent::request: ()
LWP::UserAgent::send_request: GET http://localhost:80/Main.do
LWP::UserAgent::_need_proxy: Not proxied
LWP::Protocol::http::request: ()
LWP::Protocol::collect: read 632 bytes
LWP::Protocol::collect: read 4096 bytes
LWP::Protocol::collect: read 2874 bytes
LWP::UserAgent::request: Simple response: OK
GET http://localhost:80/Main.do
200 OK
Cache-Control: no-store, must-revalidate, post-check=0, pre-check=0
Connection: close
Date: Tue, 25 Jul 2006 18:42:30 GMT
Age: 18
Server: Apache/2.2.2 (Unix)
Vary: Accept-Encoding,User-Agent
Content-Encoding: gzip
Content-Length: 7602
Content-Type: text/html;charset=ISO-8859-1
Expires: Tue, 25 Jul 2006 18:45:13 GMT
Last-Modified: Tue, 25 Jul 2006 18:42:13 GMT
Client-Date: Tue, 25 Jul 2006 18:42:30 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
error_log
#########
[Tue Jul 25 11:42:30 2006] [debug] mod_cache.c(280): cache: running CACHE_OUT
filter
[Tue Jul 25 11:42:30 2006] [debug] mod_cache.c(294): cache: serving /Main.do
#############
Third Request ( Problem-It correctly detects a vary header mismatch but doesn't
cache the results. )
#############
I make the third request using a different "User-Agent" ( firefox in this case )
error_log
#########
[Tue Jul 25 11:43:18 2006] [debug] cache_storage.c(246): cache_select_url():
Vary header mismatch.
[Tue Jul 25 11:43:18 2006] [debug] mod_cache.c(131): Adding CACHE_SAVE filter
for /Main.do
[Tue Jul 25 11:43:18 2006] [debug] mod_cache.c(138): Adding CACHE_REMOVE_URL
filter for /Main.do
***snip fetches data correctly***
[Tue Jul 25 11:43:20 2006] [debug] mod_deflate.c(447): [client 127.0.0.1] Zlib:
Compressed 35168 to 7751 : URL /Main.do
[Tue Jul 25 11:43:20 2006] [debug] mod_headers.c(612): headers:
ap_headers_output_filter()
I don't see "cache: Caching url: /Main.do" or "cache: Removing CACHE_REMOVE_URL
filter" log messages like in the first request.Looks like it caches compressed
content only for the first type of "User-Agent" ?
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DO NOT REPLY [Bug 40090] - mod_deflate/mod_mem_cache issues
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------- Additional Comments From apacheuser123@hotmail.com 2006-07-26 19:50 -------
Thanks for the feedback,Ruediger. Apart from using mod_disk_cache, the other
option I can think of is to not have the User-Agent in the Vary header. The only
reason I have it there is for the BrowserMatch directives for mod_deflate. Maybe
I can get rid of those directives ?
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
------- Additional Comments From rpluem@apache.org 2006-07-22 16:14 -------
This also happens with mod_disk_cache. The reason is that the first filter in
the filter chain that we kick off in the quick handler for a cached entity is
the deflate filter. This filter adds an eos bucket to our empty brigade. This
results in a brigade that looks like the following being delivered to the
content_length filter:
EOS bucket
File bucket
EOS bucket
Thus the content_length filter calculates 0 as Content-Length. While one might
argue that the behaviour of the deflate output filter is broken and that it
should not add an eos bucket to the brigade if it has not seen one, I think we
should start the filter chain always with our cache out filter when we kick off
the filter chain in the quick handler, as this is the point where we actually
saved the cached data during caching.
Please give the attached patch a try (patch against trunk, but also works
against 2.2.2) and let me know if it solves your problem.
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------- Additional Comments From rpluem@apache.org 2006-12-21 13:07 -------
Proposed for backport as r489460
(http://svn.apache.org/viewvc?rev489460=&view=rev).
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------- Additional Comments From rpluem@apache.org 2006-07-22 16:15 -------
Created an attachment (id=18627)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=18627&action=view)
Patch against trunk
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |RESOLVED
Resolution| |FIXED
------- Additional Comments From rpluem@apache.org 2007-05-17 04:01 -------
Backported to 2.2.x as r538868
(http://svn.apache.org/viewvc?rev=538868&view=rev).
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------- Additional Comments From rpluem@apache.org 2006-07-22 22:13 -------
(In reply to comment #2)
> This also happens with mod_disk_cache. The reason is that the first filter in
> the filter chain that we kick off in the quick handler for a cached entity is
> the deflate filter. This filter adds an eos bucket to our empty brigade. This
I must correct myself. The deflate out filter returns immediately without
passing the empty brigade down the chain. So the EOS at the start of the brigade
that we are seeing is actually caused by ap_finalize_request_protocol. But my
further conclusions are still valid.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |croller@generali.fr
------- Additional Comments From rpluem@apache.org 2006-12-21 12:45 -------
*** Bug 40278 has been marked as a duplicate of this bug. ***
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