*head in hands* wait. So the x-gzip-canary header is in the FIlesMatch. If I download https://domain/styles2.css, I do not see the x-gzip-canary in Chrome. But if I download https://domain/styles2.css.gz, I *do* see the header. So… what does that mean? That the FilesMatch only applies to manually-dialed .css.gz files? Or that the IfModule block is not rewriting as I expect it to?