嗨，我在用 HttpsURLConnection 为了连接外部服务，它只在很少的事务中工作，但是在一段时间之后它失败了，并且得到了低于错误的结果

Unable to tunnel through proxy. Proxy returns "HTTP/1.1 403 Forbidden

我打印 connection.getErrorStream() 它给 null 请查找以下代码，它在os=connection.getoutputstream（）处失败；

connection = restConfiguration.getSSLConnection(url, connection);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
connection.setRequestProperty("Accept", "application/json; charset=UTF-8");
connection.setRequestProperty("Authorization", "Bearer " + authorization);
os = connection.getOutputStream();
os.write(signOrderRequest.toJson().getBytes("UTF-8"));
os.flush();

有什么建议和想法吗？