Connection refused by server and Unknown error javafx.web after loading page with port 3000

Question

When loading http://127.0.0.1:3000 I get this error:

java.lang.Throwable: Unknown error
        at [email protected]/javafx.scene.web.WebEngine$LoadWorker.describeError(WebEngine.java:1444)
        at [email protected]/javafx.scene.web.WebEngine$LoadWorker.dispatchLoadEvent(WebEngine.java:1383)
        at [email protected]/javafx.scene.web.WebEngine$PageLoadListener.dispatchLoadEvent(WebEngine.java:1244)
        at [email protected]/com.sun.webkit.WebPage.fireLoadEvent(WebPage.java:2563)
        at [email protected]/com.sun.webkit.WebPage.fwkFireLoadEvent(WebPage.java:2407)
        at [email protected]/com.sun.webkit.network.URLLoaderBase.twkDidFail(Native Method)
        at [email protected]/com.sun.webkit.network.HTTP2Loader.notifyDidFail(HTTP2Loader.java:628)
        at [email protected]/com.sun.webkit.network.HTTP2Loader.lambda$didFail$18(HTTP2Loader.java:610)
        at [email protected]/com.sun.webkit.network.HTTP2Loader.lambda$callBackIfNotCanceled$10(HTTP2Loader.java:441)
        at [email protected]/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at [email protected]/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
        at [email protected]/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at [email protected]/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at [email protected]/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
        at java.base/java.lang.Thread.run(Thread.java:833)

It is also possible to get a 'Connection refused by server' error when loading a page on port 3000, but not a local one:

java.lang.Throwable: Connection refused by server
        at [email protected]/javafx.scene.web.WebEngine$LoadWorker.describeError(WebEngine.java:1444)
        at [email protected]/javafx.scene.web.WebEngine$LoadWorker.dispatchLoadEvent(WebEngine.java:1383)
        at [email protected]/javafx.scene.web.WebEngine$PageLoadListener.dispatchLoadEvent(WebEngine.java:1244)
        at [email protected]/com.sun.webkit.WebPage.fireLoadEvent(WebPage.java:2563)
        at [email protected]/com.sun.webkit.WebPage.fwkFireLoadEvent(WebPage.java:2407)
        at [email protected]/com.sun.webkit.network.URLLoaderBase.twkDidFail(Native Method)
        at [email protected]/com.sun.webkit.network.HTTP2Loader.notifyDidFail(HTTP2Loader.java:628)
        at [email protected]/com.sun.webkit.network.HTTP2Loader.lambda$didFail$18(HTTP2Loader.java:610)
        at [email protected]/com.sun.webkit.network.HTTP2Loader.lambda$callBackIfNotCanceled$10(HTTP2Loader.java:441)
        at [email protected]/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at [email protected]/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
        at [email protected]/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at [email protected]/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at [email protected]/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
        at java.base/java.lang.Thread.run(Thread.java:833)

I have tried this but without success:

HostnameVerifier allHostsValid = new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        };
        HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);

And it:

TrustManager[] trustAllCerts = new TrustManager[] {
                new X509TrustManager() {
                    public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }
                    public void checkClientTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }
                    public void checkServerTrusted(
                            java.security.cert.X509Certificate[] certs, String authType) {
                    }
                }
        };

        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (GeneralSecurityException e) {
            System.out.println("SSL trust error: " + e.getMessage());
        }

Errors occur along with the status Worker.State.FAILED. With what it can be connected?

Answer 1

This worked for me and the pages now run, but it still doesn't work well. Some pages on port 3000 open and then redirect to index.html, which shouldn't happen.:

System.setProperty("http.proxyHost","my.site.com");
System.setProperty("http.proxyPort","3000");