How do I get a proxy free connection in Java?

When establishing a connection with urlconnection, how to avoid passing through proxyselector, or how to ensure that the connection is not affected by any agent known to Java?

I think this is proxy NO_ Purpose of proxy Reference Javadoc:

However, such a connection will still be through proxyselector Don't I understand?

I did a little test to prove my point:

public static void main(String[] args) throws MalformedURLException,IOException {
    ProxySelector.setDefault(new MyProxySelector());
    URL url = new URL("http://foobar.com/x1/x2");
    URLConnection connection = url.openConnection(Proxy.NO_PROXY);
    connection.connect();
}

And a virtual proxyselector that does nothing but record what is happening:

public class MyProxySelector extends ProxySelector {

    @Override
    public List<Proxy> select(URI uri) {
        System.out.println("MyProxySelector called with URI = " + uri);
        return Collections.singletonList(Proxy.NO_PROXY);
    }

    @Override
    public void connectFailed(URI uri,SocketAddress sa,IOException ioe) {}
}

Print:

"MyProxySelector called with URI = socket://foobar.com:80"

(note how the protocol changes from HTTP to socket)

Of course I can create my proxyselector so that it always returns proxy NO_ Proxy, if the URI scheme is socket, but I think it is possible to have a socks proxy on the website, and then it will not be true

Let me reiterate this problem: I need a way to ensure that a specific urlconnection does not use a proxy, no matter what system properties can be set or what proxyselector can be installed

Solution

This is traced to JDK bug 8144008