docs: protected static void registerAlpnSupport(SSLConnectionLink connLink, SSLEngine engine) {
          ThirdPartyAlpnNegotiator negotiator = null;
          boolean useAlpn = isH2Active(connLink);
          // try to register with one of the alpn providers.  If useAlpn is false, tell the active ALPN handler to skip negotiation
          if (tc.isDebugEnabled()) {
              Tr.debug(tc, "registerAlpnSupportDuringHandshake, h2 protocol enabled: " + useAlpn);
          }
          negotiator = alpnNegotiator.tryToRegisterAlpnNegotiator(engine, connLink, useAlpn);
          connLink.setAlpnNegotiator(negotiator);
      }