Proxy-Parameters beeing ignored

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Reading https://memorynotfound.com/configure-http-proxy-settings-java/, it says:

Authenticating Proxy

Setting http.proxyUser and http.proxyPassword will not automatically authenticate via a proxy.

Taking the above into account. Here is how you can Authenticate via a proxy. This initialisation code is typically executed at application startup. So make sure you register this authenticator before you make any HTTP Requests that require Proxy Authentication.

// settings proxy credentials
System.setProperty("http.proxyUser", "proxyUser");
System.setProperty("http.proxyPassword", "secret");

// Java ignores http.proxyUser. Here come's the workaround.
Authenticator.setDefault(new Authenticator() {
    @Override
    protected PasswordAuthentication getPasswordAuthentication() {
        if (getRequestorType() == RequestorType.PROXY) {
            String prot = getRequestingProtocol().toLowerCase();
            String host = System.getProperty(prot + ".proxyHost", "");
            String port = System.getProperty(prot + ".proxyPort", "80");
            String user = System.getProperty(prot + ".proxyUser", "");
            String password = System.getProperty(prot + ".proxyPassword", "");
            if (getRequestingHost().equalsIgnoreCase(host)) {
                if (Integer.parseInt(port) == getRequestingPort()) {
                    return new PasswordAuthentication(user, password.toCharArray());
                }
            }
        }
        return null;
    }
});

Is it possible that Xwiki has yet to “learn” to use a proxy with auth the right way??