On 3/24/06, Mikel Maron <mikel_maron@xxxxxxxxx> wrote:
> The last time I was investigating this, things got stuck with Squid. I was
> trying to implement cache invalidation on a list of cache objects, using the
> squidpurge tool, and it wasn't working brilliantly. Help welcome.
What was the problem? I have to date had no problem with invalidating
my very very very simple test pages (just ordinary CGIs without
changing the URLs)..
I got a nice tip from Henrik Nordström of Squid fame, if you add a
header to the request you can tell squid to only give to the image if
it is cached. Very usefull, and perhaps a good idea to use in the
applet..
Cache-Control: only-if-cached
Compare:
# noncached tile
wget --header "Cache-Control: only-if-cached"
'http://tile.openstreetmap.org/cgi-bin/steve/mapserv?map=/usr/lib/cgi-bin/steve/wms.map&service=WMS&WMTVER=1.0.0&REQUEST=map&STYLES=&TRANSPARENT=TRUE&LAYERS=landsat,streets&WIDTH=256&HEIGHT=128&BBOX=17.841873,59.332920536311434,17.929764,59.39'
# cached tile
wget
http://tile.openstreetmap.org/cgi-bin/steve/mapserv?map=/usr/lib/cgi-bin/steve/wms.map&service=WMS&WMTVER=1.0.0&REQUEST=map&STYLES=&TRANSPARENT=TRUE&LAYERS=landsat,streets&WIDTH=256&HEIGHT=128&BBOX=17.841873,59.332920536311434,17.929764,59.355327237805916
--
/Erik
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