Java GDAX沙盒修复连接

没有从GDAX沙盒HTTP连接获得任何响应。正在尝试连接gdax沙盒以修复连接以下订单

连接的URL=

进行HTTP连接并升级到修复的示例代码：

try {
    String httpsURL = "https://fix-public.sandbox.gdax.com";
    URL url = new URL(httpsURL);
    //URLConnection conn = url.openConnection();
    HttpsURLConnection conn = (HttpsURLConnection)url.openConnection();
    conn.setRequestProperty("Connection", "Upgrade" );
    conn.setRequestProperty("Upgrade", "fix" );

    conn.connect();

    System.out.println(" Connected url = " + url.toString());
    System.out.println(" getResponseCode = " + conn.getResponseCode());
}

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沙箱在2017年初至中期关闭。我在图书馆里记录了这一点。据我所知，没有向开发人员发出关于这一点的通知，但在他们的社区页面IIRC中提到了这一点。

沙箱在2017年初至中期关闭。我在图书馆里记录了这一点。据我所知，并没有向开发者发出关于此事的通知，但在他们的社区网页IIRC中提到了这一点

try {
    String httpsURL = "https://fix-public.sandbox.gdax.com";
    URL url = new URL(httpsURL);
    //URLConnection conn = url.openConnection();
    HttpsURLConnection conn = (HttpsURLConnection)url.openConnection();
    conn.setRequestProperty("Connection", "Upgrade" );
    conn.setRequestProperty("Upgrade", "fix" );

    conn.connect();

    System.out.println(" Connected url = " + url.toString());
    System.out.println(" getResponseCode = " + conn.getResponseCode());
}