One more question: Say I'm using the above block, and I take Measures ("Header append X-gzip-canary Yes", as recommended by Vriska Serket, who follows me here on Mastodon) to check if the .gz cache is being accepted. And it's not being accepted.
Should I expect an <IfModule mod_headers.c> *inside* a <VirtualHost> block to work as expected (IE, to both work, and to only apply to the specific VirtualHost of that block)?