WKD: Subdomain openpgpkey

[Christoph Klassen]

Hello,

in the draft of Werner Koch about WKD there is this paragraph:

There are two variants on how to form the request URI: The advanced
and the direct method.  Implementations MUST first try the advanced
method.  Only if the required sub-domain does not exist, they SHOULD
fall back to the direct method. [1]

I think it needs to be clarified what it means that the sub-domain 
doesn't exist. If a server doesn't offer this sub-domain, it doesn't 
exist .. check. But what, if it does offer this sub-domain and the 
server isn't available for some reason? Does that case count as "does 
not exist"?

[1] https://datatracker.ietf.org/doc/draft-koch-openpgp-webkey-service/


Greetings,

Christoph

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