Android 7.1.2 平台

连接WiFi后，显示connect，no Internet，同时伴有notifaction的通知。

产生现象原因：

frameworks/base/services/core/java/com/android/server/connectivity/NetworkMonitor.java

frameworks/base/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java

先看NetworkMonitor.java

// Default configuration values for captive portal detection probes.
    // TODO: append a random length parameter to the default HTTPS url.
    // TODO: randomize browser version ids in the default User-Agent String.
    private static final String DEFAULT_HTTPS_URL     = "https://www.google/generate_204";   
    //private static final String DEFAULT_HTTP_URL      =
            //"http://connectivitycheck.gstatic/generate_204"; 
    private static final String DEFAULT_HTTP_URL =
            " http://www.noisyfox/generate_204"
    private stat