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While working on cache control for the sendFile() method, I did some additional research into the Etag header. Seems easy enough to implement and could be useful for saving data transfer fees in Lambda.
There are a lot of possible capabilities with this, including concurrency control for updating resources. I'm going to add that as a separate potential capability.
close #22 by adding preliminary etag support
I've added preliminary support for this, but it needs to be enabled on each response by using the chainable etag() method.