Hi Mario,

> On 28 May 2024, at 09:23, Mario Loffredo <mario.loffr...@iit.cnr.it> wrote:
> 
> Hi, 
> here in the following some comments about this extension:
> 
> 1)  Don't know how to formally use this extension with HEAD as this method 
> doesn't return the body.
> Hence, it would represent a case where the server returns an extension 
> without signaling it in the rdapConformance array.

I didn't put this into the draft, but my assumption was that clients would 
"remember" which servers supported the extension to improve performance on 
subsequent requests.

> 3) Wonder how many servers don't include the registrar entity in the response 
> to a domain lookup.
> The gTLD RDAP response profile requires servers to do that.
> As a result, I'm afraid that this extension would be useless.

This extension is not trying to compensate for missing information, but to 
reduce the "cost" (on both client and server side) of following a referral.

G.

--
Gavin Brown
Principal Engineer, Global Domains & Strategy
Internet Corporation for Assigned Names and Numbers (ICANN)

https://www.icann.org

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