src/java.net.http/share/classes/jdk/internal/net/http/AbstractAsyncSSLConnection.java

*** 78,92 ****
          sslParameters = createSSLParameters(client, serverName, alpn);
          Log.logParams(sslParameters);
          engine = createEngine(context, serverName.getName(), port, sslParameters);
      }
  
-     abstract HttpConnection plainConnection();
      abstract SSLTube getConnectionFlow();
  
      final CompletableFuture<String> getALPN() {
-         assert connected();
          return getConnectionFlow().getALPN();
      }
  
      final SSLEngine getEngine() { return engine; }
  
--- 78,90 ----