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because this mechanism is most needed behind a reverse proxy, where acme tls-alpn-01 won't work (because the reverse proxy won't pass on the alpn extensions). if that's the case, there is obviously a webserver on port 443. and it likely also running on port 80. so before this change, if tls-alpn-01 isn't available, http-01 also wasn't available, leaving no validation mechanisms. for issue #218 by mgkirs, thanks for reporting and details. hope this helps.