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Status: Verified (1)

RFC 8910, "Captive-Portal Identification in DHCP and Router Advertisements (RAs)", September 2020

Source of RFC: capport (art)

Errata ID: 6620
Status: Verified
Type: Technical
Publication Format(s) : TEXT, PDF, HTML

Reported By: Vittorio Gambaletta (VittGam)
Date Reported: 2021-06-23
Verifier Name: Erik Kline
Date Verified: 2021-06-24

Section 2 says:

   A captive portal MAY do content negotiation (Section 3.4 of
   [RFC7231]) and attempt to redirect clients querying without an
   explicit indication of support for the captive portal API content
   type (i.e., without application/capport+json listed explicitly
   anywhere within an Accept header field as described in Section 5.3 of
   [RFC7231]).  In so doing, the captive portal SHOULD redirect the
   client to the value associated with the "user-portal-url" API key.
   When performing such content negotiation (Section 3.4 of [RFC7231]),
   implementors of captive portals need to keep in mind that such
   responses might be cached, and therefore SHOULD include an
   appropriate Vary header field (Section 7.1.4 of [RFC7231]) or set the
   Cache-Control header field in any responses to "private" or a more
   restrictive value such as "no-store" (Section 5.2.2.3 of [RFC7234]).

It should say:

   A captive portal MAY do content negotiation (Section 3.4 of
   [RFC7231]) and attempt to redirect clients querying without an
   explicit indication of support for the captive portal API content
   type (i.e., without application/captive+json listed explicitly
   anywhere within an Accept header field as described in Section 5.3 of
   [RFC7231]).  In so doing, the captive portal SHOULD redirect the
   client to the value associated with the "user-portal-url" API key.
   When performing such content negotiation (Section 3.4 of [RFC7231]),
   implementors of captive portals need to keep in mind that such
   responses might be cached, and therefore SHOULD include an
   appropriate Vary header field (Section 7.1.4 of [RFC7231]) or set the
   Cache-Control header field in any responses to "private" or a more
   restrictive value such as "no-store" (Section 5.2.2.3 of [RFC7234]).

Notes:

In RFC8908 the relevant Content-Type is defined as "application/captive+json" and not "application/capport+json".

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