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Update :protocol to webtransport-h3 for WebTransport over HTTP/3 #1930

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Update :protocol to webtransport-h3 for WebTransport over HTTP/3 #1930

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5f4965e
Set :protocol to webtransport-h3 for WebTransport over HTTP/3
jan-ivar May 30, 2026
3fff39e
Note "webtransport" is for H2, "webtransport-h3" for H3
jan-ivar Jun 1, 2026
6459f41
Assert method and pseudo-header
jan-ivar Jun 1, 2026
eb06c09
nits
annevk Jun 26, 2026
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24 changes: 24 additions & 0 deletions fetch.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,12 @@ urlPrefix:https://www.rfc-editor.org/rfc/rfc6454;type:dfn;spec:RFC6454
"publisher": "IETF",
"title": "WebTransport over HTTP/3"
},
"WEBTRANSPORT-HTTP2": {
"authors": ["E. Kinnear"],
"href": "https://datatracker.ietf.org/doc/html/draft-ietf-webtrans-http2",
"publisher": "IETF",
"title": "WebTransport over HTTP/2"
},
"SVCB": {
"aliasOf": "RFC9460"
}
Expand Down Expand Up @@ -6656,6 +6662,24 @@ optional boolean <var>forceNewConnection</var> (default false), run these steps:
to the <a for=/>coarsened shared current time</a> given <var>fetchParams</var>'s
<a for="fetch params">cross-origin isolated capability</a>.

<li>
<p>If <var>request</var>'s <a for=request>mode</a> is "<code>webtransport</code>":

<ol>
<li><p><a for=/>Assert</a>: <var>request</var>'s <a for=request>method</a> is
`<code>CONNECT</code>`.

<li><p><a for=/>Assert</a>: the "<code>:protocol</code>" pseudo-header associated with
<var>request</var> is "<code>webtransport</code>".

<li>
<p>If <var>connection</var> is an HTTP/3 connection, then set the "<code>:protocol</code>"
pseudo-header to "<code>webtransport-h3</code>". [[!WEBTRANSPORT-HTTP3]]

<p class=note>"<code>webtransport</code>" remains the correct value for WebTransport over an
HTTP/2 connection. [[WEBTRANSPORT-HTTP2]]
</ol>

<li>
<p>Set <var>response</var> to the result of making an HTTP request over <var>connection</var>
using <var>request</var> with the following caveats:
Expand Down