Conflicting requirements?

Martin Duke <martin.h.duke@gmail.com> Mon, 08 June 2020 21:01 UTC

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From: Martin Duke <martin.h.duke@gmail.com>
Date: Mon, 8 Jun 2020 14:00:52 -0700
Message-ID: <CAM4esxSg=oWNLUoNK6Rg6x1KL5NvtWz8qyvk3aa-UWL3HtaodA@mail.gmail.com>
Subject: Conflicting requirements?
To: IETF QUIC WG <quic@ietf.org>
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In section 8.1 of quic-transport,
When using ALPN, endpoints MUST immediately close a connection (see Section
10.3 of [QUIC-TRANSPORT
<https://quicwg.org/base-drafts/draft-ietf-quic-tls.html#QUIC-TRANSPORT>])
with a no_application_protocol TLS alert (QUIC error code 0x178; see Section
4.10 <https://quicwg.org/base-drafts/draft-ietf-quic-tls.html#tls-errors>)
if an application protocol is not negotiated.

In 4.10 of quic-tls,
Endpoints MAY use a generic error code to avoid possibly exposing
confidential information.

Which one takes precedence? May the server send a generic error when there
is no ALPN code?