Using HTTP/2 on the same port as HTTPS doesn't seem to be possible at the moment. Jetty itself does seem to support this, according to https://www.eclipse.org/jetty/documentation/9.4.x/http2-configuring.html

      Jenkins does not start when using the same port with --httpsPort and --http2Port.

          [JENKINS-46931] Allow using HTTP/2 on the same port as HTTPS

          Joachim Mairböck created issue -

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            jmairboeck Joachim Mairböck
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