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<h4>upgrade</h4>
<pre>&lt;T extends <a href="../../../jakarta/servlet/http/HttpUpgradeHandler.html" title="interface in jakarta.servlet.http">HttpUpgradeHandler</a>&gt;&nbsp;T&nbsp;upgrade(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;T&gt;&nbsp;handlerClass)
  