strongloop/express — pull request #2473 by danielgindi (2014-12-16 17:34:01+00:00)
Title: ETag should not be generated for no-store

Cache-Control: no-store does not allow the User-Agent to consult anything for caching, as it does not allow caching at all.
This is opposed to no-cache where ETag can be consulted and compared against a HEAD request.