I'm on a site running on HTTP/2 and I realized the following caching setup: cache-control:max-age=604800, private etag:W/"115-54e8a25e7b187" expires:Fri, 14 Jul 2017 11:39:45 GMT last-modified:Tue, 02 May 2017 13:02:11 GMT Some questions about this setup: is it not a problem that cache-control and expires are for different time intervals? are etag and last-modified not redundant? is there something else that should be done in terms of caching for performance if HTTP/2 is in use?

Caching and HTTP/2

I'm on a site running on HTTP/2 and I realized the following caching setup:

cache-control:max-age=604800, private
etag:W/"115-54e8a25e7b187"
expires:Fri, 14 Jul 2017 11:39:45 GMT
last-modified:Tue, 02 May 2017 13:02:11 GMT

Some questions about this setup:

is it not a problem that cache-control and expires are for different time intervals?
are etag and last-modified not redundant?
is there something else that should be done in terms of caching for performance if HTTP/2 is in use?