s the source of a request.</p><p>If not set, any source is allowed.</p></td><td>No</td></tr><tr id=Rule-to><td><code>to</code></td><td><code><a href=#Rule-To>To[]</a></code></td><td><p>Optional. to specifies the operation of a request.</p><p>If not set, any operation is allowed.</p></td><td>No</td></tr><tr id=Rule-when><td><code>when</code></td><td><code><a href=#Condition>Condition[]</a></code></td><td><p>Optional. when specifies a list of additional conditions of a request.</p><p>If not set, any condition