Before I change it, is there any huge reason "fastcgi_ignore_headers Cache-Control Expires;" and "expires epoch;" should stay in my fastcgi-params file?
nginx honours the headers the backend sends.
Often dynamic applications (like php when using sessions etc) send headers which "deny" any kind of caching ( Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 and Expires header in the past) so to cache such responses nginx has to override theese headers.
In this case though without the context the 'epires epoch;' directive makes not a lot of sense (at least for me) since it sets the epire header to 1 January, 1970 00:00:01 GMT meaning it shouldn't be cached.
I always feel that setting the expire/cache headers in the application (unless imposible to change the code) is more flexible and allows to avoid errors (caching something for too long or wrong response) rather than overriding it in the proxy.
Also I wouldn't put the expire/header directives in the fastcgi_params file since that means you use those for every request versus putting in some specific location {} blocks.
rr
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