(Disclosure: I'm a Caddy maintainer), Caddy already supports ECH, leaning on the DNS plugins to automate setting the DNS HTTPS records to wire it up. Here's a lot of technical detail about it https://caddyserver.com/docs/automatic-https#encrypted-clien...

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arowthway 4 hours ago | parent [-]

Nginx also supports ECH now, since the December release.

	▲	mholt 2 hours ago \| parent [-]
		But does it automatically provision the DNS records and rotate the keys? I'm actually kind of furious at nginx's marketing materials around ECH. They compare with other servers but completely ignore Caddy, saying that they're the only practical path to deploying ECH right now. Total lies: https://x.com/mholt6/status/2029219467482603717