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

vanupam commented on this pull request.



>  
  <li>
   <p>Let <var>connection</var> be the result of establishing an HTTP connection to
-  <var>origin</var>. [[!HTTP]] [[!HTTP-SEMANTICS]] [[!HTTP-COND]] [[!HTTP-CACHING]] [[!HTTP-AUTH]] [[!TLS]]
+  <var>origin</var>. [[!HTTP]] [[!HTTP2]] [[!HTTP-SEMANTICS]] [[!HTTP-COND]] [[!HTTP-CACHING]] [[!HTTP-AUTH]] [[!TLS]]
+
+  <p>If <var>credentials</var> is true and if the user agent supports <a for=/>Token Binding</a>,
+  propose the use of <a for=/>Token Binding</a> while setting up a TLS connection by sending the
+  highest supported <a for=/>Token Binding</a> protocol version 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]].
+  If Token Binding Negotiation succeeds, indicating client-server agreement on protocol version
+  and <a for=/>token-binding key parameters</a>, update metadata for the TLS connection with the
+  results of the negotiation.

Added "TLS connection metadata" property of connection.

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