ECH tests - any way to include some without having to add an ECH-enabled TLS server?

Hiya,

I'd like to add some tests that exercise the experimental ECH feature,
but haven't done anything much on that as it seems like it'd be a lot
of work to add an ECH-enabled TLS server to the test harness. So I'm
looking for ideas on what to do there if someone has any...

One possibility, but maybe a bad idea, might be to use lightttpd as a
server - that now also has experimental ECH code, but downloading and
building that as part of a curl test also seems a bit OTT.

Using an external server could be done, but is obviously vulnerable to
bitrot, e.g. cloudflare changed their test URL for ECH a while back,
and while I'm fine with keeping defo.ie (and/or test.defo.ie) servers
running, that's probably not a great long-term approach.

So, ideas welcome...

Thanks,
S.

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