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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Implement Cache-control: immutable"
   href="https://bugs.webkit.org/show_bug.cgi?id=167497">167497</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Implement Cache-control: immutable
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Page Loading
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>koivisto&#64;iki.fi
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>beidson&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Cache-control value 'immutable' indicates that a subresource does not change and so does not need to be revalidated on a normal reload. This can significantly speed up reloads and reduce network traffic.

It is has been implemented in Firefox and is already used by Facebook.

<a href="https://tools.ietf.org/html/draft-mcmanus-immutable-00">https://tools.ietf.org/html/draft-mcmanus-immutable-00</a>
<a href="https://hacks.mozilla.org/2017/01/using-immutable-caching-to-speed-up-the-web/">https://hacks.mozilla.org/2017/01/using-immutable-caching-to-speed-up-the-web/</a></pre>
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