RE: [users@httpd] Reverse proxy and cache

"Airat A. Sadreev" <sadaa@xxxxxxx> · Mon, 13 Feb 2006 18:06:58 +0300

> -----Original Message-----
> From: Joshua Slive [mailto:joshua@xxxxxxxx]
> Sent: Monday, February 13, 2006 4:48 PM
> To: users@xxxxxxxxxxxxxxxx
> Subject: Re: [users@httpd] Reverse proxy and cache
>
> On 2/13/06, Садреев Айрат Алмазович
> <SadreevAA@xxxxxxxxxxxxxxxx> wrote:
> >
> >         I'd like to provide access to multiple remote
> Web-servers via my Apache using reverse proxy. Remote
> Web-servers connected via low-speed channels so I'd like to
> use caching to speed-up content loading for clients.
> >
> >         I set up reverse proxy and cache modules. The
> accessed files put into cache but download speed was not
> increased. It seems that files is reloaded every time when
> accessed and caching don't work actually.
> >
> >         This is an excerpt from my conf file
> >
> > <VirtualHost 10.10.1.2>
> >         ServerName www-root.in
> >
> >         CacheEnable disk /
> >         ProxyPass /vvmn/ http://10.34.1.23/
> >
> > </VirtualHost>
> >
> >
> >         Requested URLs looks like this
> http://www-root.in/vvmn/pics/035457.JPG
> >         10.34.1.23 - IP address of the remote server.
> >
> > What's wrong?
>
> Change LogLevel to debug and check the error log.  Apache
> follows normal http caching rules, so your response headers
> must look cachable.  Also, you should be using the most
> recent version if you want to work with mod_cache.
>
> Joshua.
>
Using Apache 2.2.0 (binary distribution from http://apachelounge.com/)
Apache running on port 85
client running on server machine (www-root.in, 10.10.1.2)

Log file is

[Mon Feb 13 17:17:30 2006] [debug] mod_cache.c(129): Adding CACHE_SAVE
filter for /vvmn/sdku/AK_VVMN_T.GDF
[Mon Feb 13 17:17:30 2006] [debug] mod_cache.c(136): Adding CACHE_REMOVE_URL
filter for /vvmn/sdku/AK_VVMN_T.GDF
[Mon Feb 13 17:17:30 2006] [debug] mod_proxy_http.c(54): proxy: HTTP:
canonicalising URL //10.34.1.23/sdku/AK_VVMN_T.GDF
[Mon Feb 13 17:17:30 2006] [debug] proxy_util.c(1373): [client 10.10.1.2]
proxy: http: found worker http://10.34.1.23/ for
http://10.34.1.23/sdku/AK_VVMN_T.GDF
[Mon Feb 13 17:17:30 2006] [debug] mod_proxy.c(736): Running scheme http
handler (attempt 0)
[Mon Feb 13 17:17:30 2006] [debug] mod_proxy_http.c(1661): proxy: HTTP:
serving URL http://10.34.1.23/sdku/AK_VVMN_T.GDF
[Mon Feb 13 17:17:30 2006] [debug] proxy_util.c(1754): proxy: HTTP: has
acquired connection for (10.34.1.23)
[Mon Feb 13 17:17:30 2006] [debug] proxy_util.c(1811): proxy: connecting
http://10.34.1.23/sdku/AK_VVMN_T.GDF to 10.34.1.23:80
[Mon Feb 13 17:17:30 2006] [debug] proxy_util.c(1911): proxy: connected
/sdku/AK_VVMN_T.GDF to 10.34.1.23:80
[Mon Feb 13 17:17:30 2006] [debug] proxy_util.c(2005): proxy: HTTP: fam 2
socket created to connect to 10.34.1.23
[Mon Feb 13 17:17:31 2006] [debug] proxy_util.c(2101): proxy: HTTP:
connection complete to 10.34.1.23:80 (10.34.1.23)
[Mon Feb 13 17:17:34 2006] [debug] mod_proxy_http.c(1443): proxy: start body
send
[Mon Feb 13 17:17:34 2006] [debug] mod_cache.c(602): cache: Caching url:
/vvmn/sdku/AK_VVMN_T.GDF
[Mon Feb 13 17:17:35 2006] [debug] mod_cache.c(608): cache: Removing
CACHE_REMOVE_URL filter.
[Mon Feb 13 17:17:35 2006] [debug] mod_disk_cache.c(954): disk_cache: Stored
headers for URL http://_default_:85/vvmn/sdku/AK_VVMN_T.GDF?
[Mon Feb 13 17:17:44 2006] [debug] mod_disk_cache.c(1035): disk_cache: Body
for URL http://_default_:85/vvmn/sdku/AK_VVMN_T.GDF? cached.
[Mon Feb 13 17:17:44 2006] [debug] mod_proxy_http.c(1530): proxy: end body
send
[Mon Feb 13 17:17:44 2006] [debug] proxy_util.c(1769): proxy: HTTP: has
released connection for (10.34.1.23)

Header from cache (file attached)

http://_default_:85/vvmn/sdku/AK_VVMN_T.GDF?Server: Microsoft-IIS/5.0
X-Powered-By: ASP.NET
Date: Mon, 13 Feb 2006 14:17:31 GMT
Content-Type: application/octet-stream
Accept-Ranges: bytes
Last-Modified: Wed, 18 Jan 2006 13:26:01 GMT
ETag: "8dbaabb9321cc61:d7b"
Content-Length: 319488
Expires: Tue, 14 Feb 2006 14:17:31 GMT

User-Agent: Wget/1.9-beta
Host: 10.10.1.2:85
Accept: */*
Max-Forwards: 10
X-Forwarded-For: 10.10.1.2
X-Forwarded-Host: 10.10.1.2:85
X-Forwarded-Server: www-root.in

Airat