On 4/5/23, 8:40 AM, "Hollenbeck, Scott" <[email protected] 
<mailto:[email protected]>> wrote:

> -----Original Message-----
> From: Mario Loffredo <[email protected] 
> <mailto:[email protected]>>
> Sent: Wednesday, April 5, 2023 4:24 AM
> To: Andrew Newton <[email protected] <mailto:[email protected]>>; Hollenbeck, Scott
> <[email protected] <mailto:[email protected]>>
> Cc: [email protected] <mailto:[email protected]>; [email protected] 
> <mailto:[email protected]>
> Subject: [EXTERNAL] Re: [regext] WGLC: draft-ietf-regext-rdap-reverse-search-
> 20
>
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> Hi Scott and Andy,
>
> Il 04/04/2023 18:33, Andrew Newton ha scritto:
> > On Tue, Apr 4, 2023 at 9:20 AM Hollenbeck, Scott
> > <[email protected] <mailto:[email protected]>> wrote:
> >> [SAH] Nit: as alluded to by Jasdip above, RFC 7231 has been obsoleted by
> RFC 9110.
> >>
> >> The 501 text is 9110 is consistent with 7231, but I don’t think it’s 
> >> limited to
> an invalid method. If the operative text is “the server does not support the
> functionality required to fulfill the request”, the response can be returned 
> for
> *any* condition in which the server does not support the functionality 
> required
> to fulfill the request. It doesn’t say that “the server does not support the
> requested method”. I still believe that 501 would be the best response.
> >>
> > After rereading the text, I agree with Scott.
>
> [ML] Just to understand better, daes it mean that an RDAP server should
> support additional lookups and searches to those really implemented with the
> only purpose of returning an error ?

[SAH] No. The point I'm trying to make is that if a client sends a valid 
request to an RDAP server, and that request can't be processed because the 
requested functionality isn't supported, then a 501 response is appropriate.

Precisely. Let's take an example. Say, a client sends a 
"nameservers/reverse_search/entity?..." query but the server has not 
implemented the "nameservers?..." search path segment (section 3.2.2 from RFC 
9082) to start with. Then, a 501 (Not Implemented) is a more appropriate 
response for this reverse search query; 400 (Bad Request) won't work here 
because that client query is well-formed to begin with. Right?

Jasdip


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