[openstreetmap-website] Increase cachablility for individual OSM elements on the API (#129)
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Thu Oct 11 21:20:46 GMT 2012
I believe (based on a few minutes' reading) [entity tags](http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11) (etags) perform exactly this function, so would be worth considering as a mechanism:
The version number of an object would be used as the etag -- either verbatim or encoded somehow -- and returned with any request Any downstream caches would be able to check the validity of their cached version by sending an if-none-match header to its upstream server. All responses in this system are cachable.
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