Added processing of the use-as-dictionary response header

Author: pmeenan

fetch.bs

@@ -1764,7 +1764,6 @@ processing requirements.
 "<code>audio</code>",
 "<code>beacon</code>",
 "<code>body</code>",
-"<code>compression-dictionary</code>",
 "<code>css</code>",
 "<code>early-hints</code>",
 "<code>embed</code>",
@@ -1967,7 +1966,7 @@ not always relevant and might require different behavior.
   <tr>
    <td>"<code>compression-dictionary</code>"
    <td>"<code>compression-dictionary</code>"
-   <td><code>default-src</code> (no specific directive)
+   <td><code>default-src</code>
    <td>HTML's <code>&lt;link rel=compression-dictionary&gt;</code>
   <tr>
    <td>"<code>download</code>"
@@ -2294,10 +2293,9 @@ bookkeeping details by the <a for=/>fetch</a> algorithm.
 
 <p>A <dfn export>subresource request</dfn> is a <a for=/>request</a>
 whose <a for=request>destination</a> is "<code>audio</code>", "<code>audioworklet</code>",
-"<code>compression-dictionary</code>", "<code>font</code>", "<code>image</code>",
-"<code>json</code>", "<code>manifest</code>", "<code>paintworklet</code>", "<code>script</code>",
-"<code>style</code>", "<code>track</code>", "<code>video</code>", "<code>xslt</code>",
-or the empty string.
+"<code>font</code>", "<code>image</code>", "<code>json</code>", "<code>manifest</code>",
+"<code>paintworklet</code>", "<code>script</code>", "<code>style</code>", "<code>track</code>",
+"<code>video</code>", "<code>xslt</code>", or the empty string.
 
 <p>A <dfn export>non-subresource request</dfn> is a <a for=/>request</a>
 whose <a for=request>destination</a> is "<code>document</code>", "<code>embed</code>",
@@ -3281,6 +3279,22 @@ or an <a>implementation-defined</a> value.
 </div>
 
 
+<h3 id=compression-dictionary-cache-partitions>Compression-dictionary cache partitions</h3>
+
+<div algorithm>
+<p>To <dfn>determine the compression-dictionary cache partition</dfn>, given a <a for=/>request</a> <var>request</var>:
+
+<ol>
+ <li><p>Let <var>key</var> be the result of <a for=request>determining the network partition key</a>
+ given <var>request</var>.
+
+ <li><p>If <var>key</var> is null, then return null.
+
+ <li><p>Return the unique compression-dictionary cache associated with <var>key</var>. [[!HTTP-COMPRESSION-DICTIONARIES]]
+</ol>
+</div>
+
+
 <h3 id=port-blocking>Port blocking</h3>
 
 <p class=note>New protocols can avoid the need for blocking ports by negotiating the protocol
@@ -6399,6 +6413,40 @@ 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>response</var>'s <a for=response>header list</a>
+  <a for="header list">contains</a> `<code>Use-As-Dictionary</code>`, then:
+  <!-- This is defined in [[!HTTP-COMPRESSION-DICTIONARIES]] -->
+
+  <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>.
+
+   <li><p>Let <var>pattern</var> be the result of creating a URL pattern from
+   <var>dictionaryValue</var>["<code>match</code>"] and <var>request</var>'s
+   <a for=request>current URL</a>.
+
+   <li><p>If <var>pattern</var> is failure or <var>pattern</var> has regexp groups, then return
+   <var>response</var>.
+
+   <li><p>Let <var>compressionDictionaryCache</var> be the result of
+   <a>determining the compression-dictionary cache partition</a> given <var>request</var>.
+
+   <li><p>If <var>compressionDictionaryCache</var> is null or <var>request</var>'s
+   <a for=request>response tainting</a> is "<code>opaque</code>", then return <var>response</var>.
+
+   <li><p>Let <var>expirationTime</var> be the time at which the <var>response</var> becomes stale.
+
+   <li><p>If <var>expirationTime</var> is not in the future, then return <var>response</var>.
+
+   <li><p>Store <var>response</var> in <var>compressionDictionaryCache</var> with its associated
+   <var>dictionaryValue</var> and <var>expirationTime</var>.
+  </ol>
+
  <li><p>Return <var>response</var>. <span class=note>Typically <var>response</var>'s
  <a for=response>body</a>'s <a for=body>stream</a> is still being enqueued to after
  returning.</span>