Add support for "zstd" as a Content-Encoding

[Lionel1]

Since the 20.06,
This new compression impacts our website, some pages which are quite big 800KB are served partly.

By disabling ZSTD is chrome, the problem is gone, pages being served in GZIP format.

Intermittent and random - Failed to load resource: net::ERR_QUIC_PROTOCOL_ERROR

I’ve read on other posts that Chrome doesn’t like malformed headers. It’s possible that cloudflare is supplying malformed headers randomly