Regarding Referrer-Policy. I don't see any reason we can't support this header. It's just not in our existing whitelist. We should probably add it in. I have never used that before myself and browser support appears to be sparse, but it seems harmless. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
@jaswrks writes...
Here's the existing Comet Cache HTTP Header Whitelist as of v170220: https://github.com/websharks/comet-cache-pro/blob/170220/src/includes/traits/Shared/HttpUtils.php#L67-L112
Requested here: https://wordpress.org/support/topic/gzip-in-cpanel/#post-9168722