ADDITIONAL SYSTEM INFORMATION :
Windows 10 Java 17

A DESCRIPTION OF THE PROBLEM :
JavaFX WebView does not handle 308 Response Code to follow the permanent redirect.

Is it just that HTTP2Loader does not handle 308?

com.sun.webkit.network.HTTP2Loader:

private boolean handleRedirectionIfNeeded(final HttpResponse.ResponseInfo rsp) {
        switch(rsp.statusCode()) {
                case 301: // Moved Permanently
                case 302: // Found
                case 303: // See Other
                case 307: // Temporary Redirect
                    willSendRequest(rsp);
                    return true;

                case 304: // Not Modified
                    didReceiveResponse(rsp);
                    didFinishLoading();
                    return true;
        }
        return false;
    }

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Load load https://webdbg.com/test/308/ in WebView and click the button.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Permanent redirect will be followed.
ACTUAL -
Permand redirect ist not being followed.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.concurrent.Worker.State;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ContextMenu;
import javafx.scene.input.ContextMenuEvent;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.scene.web.PopupFeatures;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.util.Callback;


public class HelloFX extends Application {

public static void main(String[] args) {
        launch(args);
    }

    public void start(Stage primaryStage) {
        primaryStage.setTitle("JavaFX WebView Example");

        WebView webView = new WebView();

webView.getEngine().getLoadWorker().stateProperty().addListener(new ChangeListener<Worker.State>()
        {
            @Override
            public void changed(final ObservableValue bObservable, final Worker.State oldValue, final Worker.State newValue)
            {
                if (((webView.getEngine() != null) && (webView.getEngine().getLoadWorker().getException() != null)) && (newValue == State.FAILED)) {
                    System.out.println(webView.getEngine().getLoadWorker().getException());
                }
            }
});

webView.getEngine().load("https://webdbg.com/test/308/");

        VBox vBox = new VBox(webView);
        Scene scene = new Scene(vBox, 960, 600);

        primaryStage.setScene(scene);
        primaryStage.show();

    }

}
---------- END SOURCE ----------

FREQUENCY : always