Hello Mario,
>reserved or unassignable domains.
>
>If a client submits a query about a reserved or unassignable domain,
>which response code should the server return?
>
>In my opinion, if the server returns a 404 response, it could be
>misunderstood. The client could undestand the domain is available.
a very valid question. Even if you are able to signalize that the domain is not available, you would like to further communicate the clients that they don't need to query over and over again to find out if it's expired or become free.
RFC 7483 offers status "renew prohibited"
Description: Renewal or reregistration of the object instance is
forbidden.draft-ietf-regext-epp-rdap-status-mapping refines that and introduces "server renew prohibited", which in my opinion is probably what you want to communicate (server policy).
>In the GET method, the server may include additional information
>regarding the negative answer
See above.
>, but it can't in the HEAD method.
> Maybe the 410 response code could be used in this case ?
If we agree on the above, then the HEAD answer must be a 200.
Best,
Marcos
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