Re: [quicwg/base-drafts] Transport parameters are mandatory. Fixes #2528 (#2560)

Jana Iyengar <> Wed, 27 March 2019 13:03 UTC

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From: Jana Iyengar <>
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Subject: Re: [quicwg/base-drafts] Transport parameters are mandatory. Fixes #2528 (#2560)
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janaiyengar commented on this pull request.

> @@ -1249,7 +1249,11 @@ quic_transport_parameters extension carries a TransportParameters struct when
 the version of QUIC defined in {{QUIC-TRANSPORT}} is used.
 The quic_transport_parameters extension is carried in the ClientHello and the
-EncryptedExtensions messages during the handshake.
+EncryptedExtensions messages during the handshake. Endpoints MUST send the
+quic_transport_parameters extension; endpoints that receive ClientHello or
+EncryptedExtensions messages without the quic_transport_parameters extension
+MUST terminate the TLS handshake with a fatal missing_extension alert (an error

MUST close the connection with an error of type 0x16d (equivalent to a fatal TLS missing_extension alert, see Section {{tls-errors}}).

> @@ -1258,8 +1262,8 @@ parameters will cause the handshake to fail.
 Endpoints MUST NOT send this extension in a TLS connection that does not use
 QUIC (such as the use of TLS with TCP defined in {{!TLS13}}).  A fatal
-unsupported_extension alert MUST be sent if this extension is received when the
-transport is not QUIC.
+unsupported_extension alert (an error of 0x16e) MUST be sent if this extension
+is received when the transport is not QUIC.

This is not just in your text, but while you're here, also replace the text with:
"The connection MUST be closed with an error code of type 0x16e (equivalent to a fatal TLS unsupported_extension alert, see Section {{tls-errors}}) if the transport is not QUIC."

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