Please add ECH (Encrypted Client Hello) support

ESNI had been blocked in China up to now, the latest Encrypted Client Hello draft version is 13, but note
Encrypted Client Hello: the future of ESNI in Firefox , " Firefox 85 replaces ESNI with ECH draft-08, and another update to draft-09 (which is targeted for wider interoperability testing and deployment) is forthcoming", please consider deploy ECH so that we could appraise how well it works.

Two of the authors of the IEFT Draft are from Cloudflare, and there was a blog post about their work on the standard recently (link below). Cloudflare have started to roll out ECH support for some free domains in certain geographic regions. I expect a few more drafts before widespread deployment starts.

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