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    <p>Hi,</p>
    <p>A sub-thread just on this one aspect of media type to be used in
      rdap-x, or generally content negotiation.</p>
    <div class=3D"moz-cite-prefix">On 12.11.24 21:46, Andrew Newton (andy=
)
      wrote:<br>
    </div>
    <blockquote type=3D"cite"
cite=3D"mid:CAAQiQRcy_ygfO42ATpV-C2bpBBfOUZbpNWhgHJ8qKZ345oS63Q@mail.gmai=
l.com">
      <pre wrap=3D"" class=3D"moz-quote-pre">responding to both Mario and=
 JGould in line...

On Mon, Nov 4, 2024 at 5:50=E2=80=AFAM Mario Loffredo
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:mario.loffredo=3D40iit.=
cnr.it@dmarc.ietf.org">&lt;mario.loffredo=3D40iit.cnr.it@dmarc.ietf.org&g=
t;</a> wrote:

</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"" class=3D"moz-quote-pre">


Section 3 "Using The RDAP-X Media Type"

My initial thought upon re-review of this section was to reuse the existi=
ng "application/rdap+json" media type by adding the optional parameter "e=
xtensions", or better "rdapx" to the media type registration, but then I =
got to Appendix B.1 that makes a good point with the language in RFC 6838=
=2E  I really don't want to include RDAP-X in the content-type header of =
the response, since it duplicates the rdapConformance member, and require=
s updating RFC 7480 with no real positive value.  Updating RFC 7480 may a=
lso trigger the need to bump rdap_level_0 to rdap_level_1, which is certa=
inly not desired.  We should re-evaluate the language of RFC 6838 in its =
application to an RDAP extension.  How about adding support for RDAP-X in=
 the accept header of the request and to have the response content-type h=
eader remain using the existing media type of "application/rdap+json"?  T=
his would meet the need of the client providing the RDAP extension hints =
without the negative side effects of updating RFC 7480 and bumping rdap_l=
evel_0 to rdap_level_1.

</pre>
      </blockquote>
      <pre wrap=3D"" class=3D"moz-quote-pre">
This is an interesting idea and I think it simplifies things. Thanks.</pr=
e>
    </blockquote>
    <p>I would very much support extending application/rdap+json with an
      additional op<span style=3D"white-space: pre-wrap">tional parameter=
 of requested extensions instead of adding application/rdap-x at all. A n=
ew artificial media type seems to be a tempting approach to maintain back=
 compatibility, but maybe it is not needed at all?</span></p>
    <p><span style=3D"white-space: pre-wrap">There was an argument, that =
it would likely break the servers if unexpected parameters appear. I deci=
ded to check in reality how big the problem would be.</span></p>
    <p><span style=3D"white-space: pre-wrap">With help of small script [1=
] I queried all RDAP servers listed in IANA bootstrap list to get some st=
ats how they behave with different Accept header.</span></p>
    <p><span style=3D"white-space: pre-wrap">The results [2] show, that 9=
9.65% of the servers would deliver the same answer for 'application/rdap+=
json;extensions=3D"rdap_level_0 rdapx foo"' as they do for 'application/r=
dap+json'.</span></p>
    <p><span style=3D"white-space: pre-wrap">What with the remaining 0.35=
%? It seems they are so wrongly implemented, that they would also break i=
f an additional media type rdap-x appears in the request. 99.47% works wi=
th rdap-x as a second media type and 99.29% if you change order and put r=
dap-x first.</span></p>
    <p><span style=3D"white-space: pre-wrap">My conclusion is, that rdap-=
x will break a marginal portion of wrongly written servers, no matter if =
we keep same media type or define a new one.</span></p>
    <p><span style=3D"white-space: pre-wrap">
</span></p>
    <p><span style=3D"white-space: pre-wrap">Defining a new media type wo=
uld mean, that </span><span
      style=3D"white-space: pre-wrap">application/rdap-x+json</span><span=

      style=3D"white-space: pre-wrap"> would remain with us forever, as i=
t will never replace application/rdap+json, but will become eventually a =
common practice to support. Extending of application/rdap+json seems to m=
e less of pollution to the protocol on the long run.
</span></p>
    <p><span style=3D"white-space: pre-wrap">
</span></p>
    <blockquote type=3D"cite"
cite=3D"mid:CAAQiQRcy_ygfO42ATpV-C2bpBBfOUZbpNWhgHJ8qKZ345oS63Q@mail.gmai=
l.com">
      <blockquote type=3D"cite">
        <pre wrap=3D"" class=3D"moz-quote-pre">

Appendix B.1 "Not Reusing the Existing Media Type"

This section helped me out since my thought was to reuse the existing "ap=
plication/rdap+json" media type instead of defining the new RDAP-X media =
type.  The language in RFC 6838 is clear and adding the capability of pro=
viding hints of the RDAP extensions is new functionality, but I really do=
n't see that it's adding new functionality for the media type itself. We =
could define the existing "application/rdap+json" media type optional par=
ameters as a form of extension in the extensions draft, where it will bec=
ome an extension point without adding new functionality specific to the m=
edia type itself.  The response is still RDAP using JSON independent of t=
he mix of extensions that are used.  If use of an optional media type par=
ameter of the existing "application/rdap+json" media type cannot be done,=
 can RDAP-X be used in the accept header and not returned in the content-=
type header to get the value of RDAP-X without the negative side effect o=
f updating RFC 7480 and bumping rdap_level_0 to rdap_level_1?

[ML] Think it's worth investigating if this soultion could be feasible.

</pre>
      </blockquote>
      <pre wrap=3D"" class=3D"moz-quote-pre">
I think so. We'll look into it. See above.
</pre>
    </blockquote>
    <p>Also supportive of this one. Just extend the media type
      registration that parameters are to be expected provided by
      extensions (with usual prefix logic of RDAP etc.). New parameters
      will be then added in extensions themselves and update media type
      registration with detailed parameters.</p>
    <p>The registration tells there are no *required* parameters to the
      media type, which remains true so in my opinion neither update to
      rfc7483 or rfc7480 would be required nor would we need to bump to
      rdap_level_1.</p>
    <p><br>
    </p>
    <p>[1] <a class=3D"moz-txt-link-freetext" href=3D"https://github.com/=
pawel-kow/RDAP-tests/">https://github.com/pawel-kow/RDAP-tests/</a></p>
    <p>[2]
<a class=3D"moz-txt-link-freetext" href=3D"https://github.com/pawel-kow/R=
DAP-tests/blob/main/rdap_help_responses_20241114_IANA_bootstrap_list.md">=
https://github.com/pawel-kow/RDAP-tests/blob/main/rdap_help_responses_202=
41114_IANA_bootstrap_list.md</a></p>
    <p>=C2=A0=C2=A0=C2=A0
<a class=3D"moz-txt-link-freetext" href=3D"https://github.com/pawel-kow/R=
DAP-tests/blob/main/rdap_help_responses_20241114_IANA_bootstrap_list.csv"=
>https://github.com/pawel-kow/RDAP-tests/blob/main/rdap_help_responses_20=
241114_IANA_bootstrap_list.csv</a><br>
    </p>
    <p>Kind Regards,</p>
    <p>Pawel<br>
    </p>
    <p><br>
    </p>
  </body>
</html>

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