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Call out h3 in more places #4211

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merged 1 commit into from Oct 15, 2020
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Call out h3 in more places #4211

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7 changes: 4 additions & 3 deletions draft-ietf-quic-http.md
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Expand Up @@ -319,7 +319,9 @@ connection to that server as being authoritative for all origins with the
A client MAY attempt access to a resource with an "https" URI by resolving the
host identifier to an IP address, establishing a QUIC connection to that address
on the indicated port, and sending an HTTP/3 request message targeting the URI
to the server over that secured connection.
to the server over that secured connection. Unless some other mechanism is used
to select HTTP/3, the token "h3" is used in the Application Layer Protocol
Negotiation (ALPN; see {{!RFC7301}}) extension during the TLS handshake.

Connectivity problems (e.g., blocking UDP) can result in QUIC connection
establishment failure; clients SHOULD attempt to use TCP-based versions of HTTP
Expand All @@ -333,8 +335,7 @@ default port associated with the scheme.

An HTTP origin advertises the availability of an equivalent HTTP/3 endpoint via
the Alt-Svc HTTP response header field or the HTTP/2 ALTSVC frame ({{!ALTSVC}}),
using the Application Layer Protocol Negotiation (ALPN; see {{!RFC7301}}) token
defined in {{connection-establishment}}.
using the "h3" ALPN token.

For example, an origin could indicate in an HTTP response that HTTP/3 was
available on UDP port 50781 at the same hostname by including the following
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