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Which new Protocol or Standard are you most excited about?
(sh.itjust.works)
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No, the first communication is made with your DNS server to fetch the key for encryption from an HTTPS record. If a record with key is found it is used to encrypt the Client Hello, otherwise it falls back to the unencrypted variant.
Cloudflare is not involved, unless you are hosting your domain through Cloudflare of course.
QUIC is primarily used for HTTP/3. The protocol was engineered and proposed by Google, same as with ECH and Cloudflare.