`req.fresh` and `req.stale` about expressjs.com

[tj]

from the response header field, I'll add some real examples tonight haha. basically you'd set the etag etc as you normally would and do if (req.fresh) res.status(304), it's not really something you'd need to even touch for most cases since res.send() does all that

[ForbesLindesay]

I was wondering if it might be intended to help with sending 304's for more dynamic pages. e.g. for applications with lots of read activity and only a little write activity, you might want to maintain a 'last updated' field in memory at some granularity level, then you could send 304's if that hadn't changed, without making db queries.

[tj]

yeah if you had "hot" content you could potentially circumvent a lot of the processing with custom 304 handling, the res.send() portion is still a win since you're not transferring a bunch of data but it's definitely preferred to optimize where applicable. we could probably add a nicer api on top of this stuff for that

[tciuro]

It would be good to have a request/response example that illustrates how to implement ETag support. Thanks!