-Patch-Operation-REPLACE">REPLACE</a></code></td>
<td>
<p>Replace contents of a named filter with new contents.
<code>REPLACE</code> operation is only valid for <code>HTTP_FILTER</code> and
<code>NETWORK_FILTER</code>. If the named filter is not found, this operation
has no effect.</p>

</td>
</tr>
</tbody>
</table>
</section>
<h4 id="EnvoyFilter-Patch-FilterClass">FilterClass</h4>
<section>
<p>FilterClass determines the filter insertion point in the filter chain
relative to the filters implicitly inserted 