Did Cloudflare used to remove gzip compression for unknown mime types?

I swear that as recently as April, Cloudflare was removing the gzip compression from the origin server if the mime type wasn’t recognised. I solved this by add a Cache-control: no-transform header for any mime types that should be compressed but weren’t.

But it seems now that this isn’t necessary, and the gzip compression is just being passed along. Did Cloudflare change how their compression rules work recently?

CF now uses brotli.

Yes, I know. But Cloudflare only compresses these mime types with brotli. The issue was that Cloudflare was removing gzip and sending files with unknown mime types with no compression at all.

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