Hi Rob, all, Cloudflare is now running an ECH test server here: https://crypto.cloudflare.com
We're running draft-ietf-tls-esni-09. The HTTPS resource record containing the current ECH config is available in DNS. Please let me know if you observe any bugs or otherwise have issues. Our Go implementation can be found here: https://github.com/cloudflare/go/tree/cf/src/crypto/tls Thanks! And for those in the US, happy inauguration day! - Chris P.
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