Hello everybody,
After reading the docs, config files, searching the Internet and the mail archives and experimenting with different debugging options I decided to ask for help.
My problem is that I am trying to use Squid squid-2.5.STABLE7-NT-bin.zip (on Windows 2000) to accelerate access to a particular site. I am trying to enforce cacheability of certain objects like pictures, js, etc.
My configuration is as follows:
[server] --------------> [Squid] ----> [clients]
slow VPN LANI am trying to make some classes of files to be cached on the Squid machine no matter what the server and the clients HTTP requests are.
What I am doing to alleviate this is as follows:
1. In the section for noncaching I am doing this:
acl QUERY urlpath_regex cgi-bin \? acl TOCACHE urlpath_regex -i \.htc$ acl TOCACHE urlpath_regex -i \.js$ acl TOCACHE urlpath_regex -i \.gif$ acl TOCACHE urlpath_regex -i \.jpe?g$ acl TOCACHE urlpath_regex -i \.png$ acl TOCACHE urlpath_regex -i \.css$
no_cache deny QUERY no_cache deny !TOCACHE
which means (as I suppose): do not cache dynamic things, do not cache things that are not pics, javascript files, stylesheets, etc.
2. In the section for refresh patterns I am doing:
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i \.htc$ 12 100% 12 override-expire override-lastmod reload-into-ims ignore-reload
refresh_pattern -i \.js$ 12 100% 12 override-expire override-lastmod reload-into-ims ignore-reload
refresh_pattern -i \.gif$ 12 100% 12 override-expire override-lastmod reload-into-ims ignore-reload
refresh_pattern -i \.jpe?g$ 12 100% 12 override-expire override-lastmod reload-into-ims ignore-reload
refresh_pattern -i \.png$ 12 100% 12 override-expire override-lastmod reload-into-ims ignore-reload
refresh_pattern -i \.css$ 12 100% 12 override-expire override-lastmod reload-into-ims ignore-reload
refresh_pattern . 0 20% 4320
Which means (as I suppose, apart from the default entries): pics, css-s, js-s - should be cached for 12 minutes and be held and retrieved form the cache for 12 minutes, regardless what the server and the client say about the cacheability of the objects (I know this is breaking the HTTP RFC-s, but this is fine as I consider to make the refresh patterns more specific by adding the server ip and dns name in the regex).
What I hoped this configuration to achieve is that the static content form the server should be explicitly cached after entering the squid cache and held there for 12 minutes. Thus - only the dynamically generated htmls would have to be transferred via the narrow line VPN. However when tested with the client in my situation - Internet Explorer 6.0, the client renders the pages several (2-3) times more quickly when the visualizations of pics is switched off.
I tried switching on the debugging information via:
debug_options 22,3
But the information in the log is not enough to decide what is going on exactly:
2004/11/18 16:40:32| getMaxAge: 'http://server/images/paperclip.gif'
2004/11/18 16:40:32| getMaxAge: 'http://server/images/vatresh.gif'
2004/11/18 16:40:32| getMaxAge: 'http://server/images/f_op.gif'
2004/11/18 16:40:32| getMaxAge: 'http://server/images/zaved_da.gif'
I have not tested squid itself to be the narrow point, but I would think this to be unlikely as the whole cacheable content is no more that 2MB and I have tested with a single client. The machine running Squid is good enough for the situation.
What am I missing in the big picture - how can I make the client render the pages faster. (There is no issue with the pages themselves - when viewed via LAN they show very quickly both via Squid and directly.)
Due to the particularity of the situation - enforcing the right solution - proper configuration of both the server and the clients is impossible. This is why I need enforcing caching via Squid.
Thanx in advance for reading the long letter.
Best regards: al_shopov
