是否有比上述方法更简单的方法来设置HTTP客户端以进行抢占式基本身份验证。 我必须从我的spring boot服务发布到另一个外部服务，但这在我的尝试中是不可能的。 我在这样做时犯了个错误。

CredentialsProvider provider = new BasicCredentialsProvider();
            usernamePasswordCredentials credentials = new usernamePasswordCredentials("user1","user1Pass");
            provider.setCredentials(AuthScope.ANY,credentials);
            HttpClient client = HttpClientBuilder.create().setDefaultCredentialsProvider(provider).build();

            HttpPost httpPost = new HttpPost("http://91.204.239.42:8083/broker-api/send");
            httpPost.setHeader("Content-type","application/json");
            try {
                httpPost.setEntity(new StringEntity(json));
                HttpResponse response = client.execute(httpPost);
                int statusCode = response.getStatusLine().getStatusCode();
                return statusCode;
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (Clientprotocolexception e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return 500;

此堆栈跟踪

 org.apache.http.conn.httphostconnectexception: Connect to 91.204.239.42:8083 [/91.204.239.42] failed: Connection refused: connect
    at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:156) ~[httpclient-4.5.9.jar:4.5.9]
    at org.apache.http.impl.conn.PoolingHttpClientConnectionmanager.connect(PoolingHttpClientConnectionmanager.java:374) ~[httpclient-4.5.9.jar:4.5.9]