Set cache-control header

[AnatoleLucet]

The current cache-control looks like this on a cached page:

cache-control: private, no-cache, no-store, max-age=0, must-revalidate

It probably shouldn't be private, the max-age should match the ttl, etc... Though this header doesn't seem to be set by next-boost, but it probably should be.

I think it's fine to keep a private, no-cache for a ttl=0 or if no rule is defined for the route.

[MisterJimson]

I also am interested in this, makes a lot of sense.