On Wed, 28 Jul 2010, Tom Hayward wrote:
This is a good point. I haven't worked much with libcurl, but
command-line curl has the ability to look at a local file and generate
an HTTP If-Modified-Since header, so if the tile has not changed, the
server should respond only with 304 Not Modified. This is the curl
command:
curl -z local.html http://remote.server.com/remote.html
The download only gets performed if the remote file is newer than the
local copy.
If libcurl supports this, this feature could be augmented to the
current tiling functions pretty easily.
We may not have any kind of a time-limit right now on the cached
tiles. In fact I think we don't. We'd need to add that and then
the curl tweak you talk about above so we wouldn't be spinning our
wheels too much. When a cached tile times out we'd check for a
newer one, else touch the timestamp on the cached tile.
--
Curt, WE7U. <http://www.eskimo.com/~archer>
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