Related question: Say I'm using the magic conf block from https://httpd.apache.org/docs/2.4/mod/mod_deflate.html#precompressed
But also it appears mod_gzip or mod_deflate or something is on— I don't remember enabling it, but https://www.giftofspeed.com/gzip-test/ says it's on.
How do I test whether it is mod_deflate or this weird mod_header trick which is handling any one request? In other words, how do I verify this paste block is doing anything at all?