Expires directive does not allow to add immutable variable to Cache-Control header
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expires directive sets 2 headers at once: Expires and Cache-Control.
Cache-Control is set to 'max-age=NNN', and can not be changed: using
add_header just produces 2 Cache-Control headers.
I suggest to add optional flag
[no_add_cache_control], that will stop
expires directive from adding Cache-Control header and allow configuration like this:
expires no_add_cache_control 1d; add_header Cache-Control "public, max-age=86400, immutable";
Cache-Control header has more variables than just
max-age, it would be nice to be able to change it while still using Expires header for user agents that do not respect Cache-Control.
immutable flag is useful to stop browsers like Firefox and Safari from creating requests for cached resources, just to get 304 response.