Re: [whatwg/fetch] Add support for compression dictionary transport (PR #1854)

@pmeenan commented on this pull request.



> @@ -6531,12 +6559,126 @@ run these steps:
  <li><p>If <var>isAuthenticationFetch</var> is true, then create an <a>authentication entry</a> for
  <var>request</var> and the given realm.
 
+ <li>
+  <p>If <var>request</var>'s <a for=request>response tainting</a> is not "<code>opaque</code>"
+  and <var>response</var>'s <a for=response>header list</a> <a for="header list">contains</a>
+  `<code>Use-As-Dictionary</code>`:
+  <!-- This is defined in [[!RFC9842]] -->
+
+  <ol>
+   <li><p>Let <var>dictionaryValue</var> be the result of
+   <a for="header list">getting a structured field value</a> given `<code>Use-As-Dictionary</code>`,
+   "<code>dictionary</code>", and <var>response</var>'s <a for=response>header list</a>.
+
+   <li><p>If <var>dictionaryValue</var> is null or <var>dictionaryValue</var>["<code>match</code>"]
+   does not <a for=map>exist</a>, then return <var>response</var>.

Added details on how to handle invalid values for the other parameters. I don't explicitly call out that unknown keys should be ignored but I can add an explicit step to delete unknown keys if you think it would help.

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