From vis...@terena.org on February 08, 2012 23:23:03
Add support for conditional HTTP GET requests in the aggregator module. This would enable clients to efficiently poll for aggregated metadata.
Could be implemented using Last-Modified/If-Modified-Since and ETag/If-None-Match headers.
The aggregator2 module seems to already have some caching logic onboard, so it makes sense to implement it there.
Original issue: http://code.google.com/p/simplesamlphp/issues/detail?id=474