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Although the use of LastModified dates for caching of git objects should be discouraged (as it is not native to git - and there are a LOT of ways this could be incorrect) - LastModified dates can be a helpful somewhat more human way of caching for simple cases. This PR adds this header and handles the If-Modified-Since header to the /raw/ routes. Fix #18354 Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: 6543 <6543@obermui.de>