support etag for read-only webcal/ics subscriptions (like the public calendar on the homepage)
I imagine this is not trivial, but it could save bandwith and cpu time if on webcal:// urls you delivered the http header etag. There are apps (icsdroid or thunderbird lightning) that seem to respect that and send you the If-None-Match header. You could reply with status 304 if there is no update...
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