WebClient through kerberos secured proxy is not working about vert.x HOT 3 OPEN

    Oid spnegoOid = new Oid("1.3.6.1.5.5.2");
    GSSManager manager = GSSManager.getInstance();
    // This is the secure proxy server that we want to authenticate to using kerberos
    String serverPrinciple = "[email protected]";
    GSSName serverName = manager.createName(serverPrinciple, GSSName.NT_HOSTBASED_SERVICE);
    GSSContext clientContext = manager.createContext(
            serverName.canonicalize(spnegoOid), spnegoOid, null, GSSContext.DEFAULT_LIFETIME);
    clientContext.requestMutualAuth(true);
    byte[] clientToken = clientContext.initSecContext(new byte[0], 0, 0);
    return Base64.getEncoder().encodeToString(clientToken);
}


@Test
public void testSecureProxy3(Vertx vertx, VertxTestContext ctx) throws GSSException {

    System.setProperty("java.security.krb5.conf", "krb5.conf");
    System.setProperty("java.security.auth.login.config", "jaas.conf");
    System.setProperty("javax.security.auth.useSubjectCredsOnly", "false");
    System.setProperty("sun.security.krb5.debug", "true");
    System.setProperty("sun.security.jgss.debug", "true");

    WebClientOptions wco = new WebClientOptions()
            .setFollowRedirects(true)
            .setSsl(true);

    ProxyOptions po = new ProxyOptions()
            .setHost("myproxy.com")
            .setPort(1234);

    wco.setProxyOptions(po);

    WebClient wc = WebClient.create(vertx, wco);

    String token = getToken();

    wc
            .getAbs("https://website_to_reach_through_proxy.com")
            .putHeader("Proxy-Authorization", "Negotiate " + token)
            .send()
            .onFailure(error -> {    // This is always returning 407 error code
                System.out.println(error.getMessage());
                ctx.failNow(error);
            })
            .onSuccess(result -> {
                System.out.println(result);
                ctx.completeNow();
            });

}