Make http optional

Author: noamr

fetch.bs

@@ -4299,11 +4299,16 @@ steps:
    <a for="fetch params">timing info</a>.</p></li>
   </ol>
  </li>
- <li><p>Otherwise, if <var>response</var>'s <a for=response>URL</a>'s <a for=url>scheme</a> is
- "<code>https</code>", then set <var>response</var>'s <a for=response>timing info</a>'s
- <a for="fetch timing info">server timing headers</a> to the result of
- <a for="header list">getting, decoding, and splitting</a> `<code>Server-Timing</code>` from
- <var>response</var>'s <a for=response>header list</a>.</p></li>
+ <li>
+  <p>Otherwise, if <var>response</var>'s <a for=response>URL</a>'s <a for=url>scheme</a> is
+  "<code>https</code>", then set <var>response</var>'s <a for=response>timing info</a>'s
+  <a for="fetch timing info">server timing headers</a> to the result of
+  <a for="header list">getting, decoding, and splitting</a> `<code>Server-Timing</code>` from
+  <var>response</var>'s <a for=response>header list</a>.
+
+  <p>The user agent may decides to expose `<code>Server-Timing</code>` headers to
+  "<code>http</code>" requests as well.
+ </li>
 
  <li>
   <p>Let <var>processResponseEndOfBody</var> be the following steps: