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Handling Last-Modified and If-Modified-Since

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ProcessWire has builtin cache system (enabled per template basis). Why ProcessWire is not using HTTP headers Last-Modified and If-Modified-Since when cache is turned on? It seems that using this headers could increase performance and is quite easy to implement.

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Good day, community!

Somehow this one was left unanswered since 2015! I have googled and found the question, but not the answer. Does anyone has a ready-made solution?

I know that processwire.com has these, but they are probably added by ProCache.

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