revise

fetch.bs

@@ -1828,6 +1828,9 @@ otherwise, it is unset.
 <a for=request>timing allow failed flag</a> are used as bookkeeping details by the
 <a for=/>fetch</a> algorithm.
 
+<p>A <a for=/>request</a> has an associated boolean <dfn for=request>allow preloads</dfn>.
+Unless stated otherwise it is true.
+
 <hr>
 
 <p>A <dfn export>subresource request</dfn> is a <a for=/>request</a>
@@ -3811,6 +3814,44 @@ the request.
  <var>request</var>'s <a for=request>origin</a> to  <var>request</var>'s <a for=request>client</a>'s
  <a for="environment settings object">origin</a>.
 
+ <li><p>Let <var>hasCustomHeaders</var> be false.
+
+ <li><p><a for=list>For each</a> <var>header</var> in <var>request</var>'s
+ <a for=request>header list</a>, if <var>header</var>'s <a for=header>name</a> is
+ not `<code>If-Modified-Since</code>`, `<code>If-None-Match</code>`, `<code>If-Unmodified-Since</code>`,
+ `<code>If-Match</code>`, `<code>Origin</code>`, `<code>User-Agent</code>`, `<code>Referer</code>`,
+ or `<code>Cache-Control</code>`, set <var>hasCustomHeaders</var> to true.
+
+ <li>
+  <p>If all of the following conditions are true:</p>
+
+  <ul class=brief>
+   <li><p><var>request</var>'s <a for=request>allow preloads</a> is true
+
+   <li><p><var>hasCustomHeaders</var> is false
+
+   <li><p><var>request</var>'s <a for=request>window</a> is not null
+
+   <li><p><var>request</var>'s <a for=request>method</a> is `<code>GET</code>`
+  </ul>
+
+  <p>then perform the following steps:
+
+  <ol>
+   <li><p>Let <var>preloadedResponse</var> be the result of invoking
+   <span>consume a preloaded resource</span> for <var>request</var>'s <a for=request>window</a>,
+   with <var>request</var>'s <a for=request>URL</a>, <var>request</var>'s <a for=request>origin</a>,
+   <var>request</var>'s <a for=request>destination</a>, <var>request</var>'s
+   <a for=request>mode</a>, <var>request</var>'s <a for=request>credentials mode</a>, and
+   <var>request</var>'s <a for=request>integrity metadata</a>.
+
+   <li><p>If <var>preloadedResponse</var> is not null, then run <a>fetch finale</a> with
+   <var>preloadedResponse</var> and <var>fetchParams</var>, and return.
+  </ol>
+ </li>
+
+
+
  <li>
   <p>If <var>request</var>'s <a for=request>policy container</a> is "<code>client</code>", then: