l/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../jakarta/websocket/Extension.html" title="interface in jakarta.websocket">Extension</a>&gt;&nbsp;extensions)</code>
<div class="block">Set the extensions for the configuration this builder will build.</div>
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<h3>Uses of <a href="../../../jakarta/websocket/Extension.html" title="interface in jakarta.webs