Re: [whatwg/fetch] Update Fetch to support Token Binding. (#325)

vanupam commented on this pull request.



> +of [[TOKBIND-PROTOCOL]].
+
+<p>At a very high level, a user agent negotiates the use of Token Binding with
+a server when it sets up a TLS connection to the server.
+It sends its highest supported
+<dfn export id=concept-token-binding-protocol-version>token-binding protocol version</dfn>
+and supported cryptographic algorithms and parameters (the
+<dfn export id=concept-token-binding-key-parameters>token-binding key parameters</dfn>)
+in a <code>token_binding</code> Client Hello Extension, as described in
+<a href="https://tools.ietf.org/html/draft-ietf-tokbind-negotiation#section-2">section 2</a>
+of the Token Binding Negotiation spec [[!TOKBIND-NEGOTIATION]].
+The user agent saves the values of the <a for=/>token-binding protocol version</a> and
+<a for=/>token-binding key parameters</a> that were negotiated for the
+TLS connection in metadata for that connection.
+
+<p>The user agent uses a `<dfn http-header><code>Sec-Token-Binding</code></dfn>`

Rephrased.

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