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

vanupam commented on this pull request.



> +<h4 id=getting-token-binding-key>Getting a Token Binding Key</h4>
+
+<p>Get the <a for=/>token-binding key</a> for an <a for=/>origin</a> <var>tokenBindingOrigin</var>
+and <a for=/>token-binding key parameters</a> <var>tokenBindingKeyParameters</var>,
+using the user agent's <a for=/>token-binding key</a> store, by running these substeps:
+
+<ol>
+ <li><p>Let <var>keyDomainName</var> be null.
+
+ <li><p>If <var>tokenBindingOrigin</var>'s host is an IP address, set <var>keyDomainName</var> to
+ <var>tokenBindingOrigin</var>'s host.
+
+ <p>Otherwise, set <var>keyDomainName</var> to the registrable domain of
+ <var>tokenBindingOrigin</var>'s host, determined by running the steps in the Algorithm section of
+ <a href=https://publicsuffix.org/list/>Public Suffix List</a>
+ [[PUBLIC-SUFFIX]]

I think the Algorithm in https://publicsuffix.org/list/ gives us the registrable domain that we want.
(https://html.spec.whatwg.org/#is-a-registrable-domain-suffix-of-or-is-equal-to  returns a boolean)

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