https://tomcat.apache.org/tomcat-9.0-doc/api/org/apache/coyote/http2/Http2AsyncUpgradeHandler.AsyncPingManager.html
Http2AsyncUpgradeHandler.AsyncPingManager (Apache Tomcat 9.0.118 API Documentation)
declaration: package: org.apache.coyote.http2, class: Http2AsyncUpgradeHandler, class: AsyncPingManager
apache tomcatapidocumentation