Java 401错误，can'；t通过授权JIRA REST API

我尝试使用RESTAPI获取一些信息

URL connection = new URL("https://jira.myorg.com/rest/api/2/issue/TEST-123");
    HttpURLConnection httpConn = (HttpURLConnection) connection.openConnection() ;

    String basicAuth = Base64.getEncoder().encodeToString(("login:pass").getBytes(StandardCharsets.UTF_8));
    httpConn.setRequestProperty ("Authorization", "Basic "+basicAuth);

但是有这样的错误：

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 401 for URL: https://jira.myorg.com/rest/api/2/issue/TEST-123
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
at java.net.URL.openStream(URL.java:1045)

如果我在《邮递员》里做的每件事都是一样的，那就好好工作吧