/3.5.3/dart-core/Duration-class.html">Duration</a></span> <span class="parameter-name">keepalivePeriod</span> = <span class="default-value">const Duration(seconds: 15)</span>, </span></li>
<li><span class="parameter" id="-param-logger"><span class="type-annotation">void</span> <span class="parameter-name">logger</span>(<ol class="parameter-list single-line"> <li><span class="parameter" id="param-"><span class="type-annotation"><a href="https://api.dart.dev/stable/3.5.3/dart-core/String-class.html">String</a