diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 16322353ad..4b1998a51a 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -1345,12 +1345,15 @@ public class ConnectivityManager {
     }
 
     /**
-     * Gets the URL that should be used for resolving whether a captive portal is present.
+     * Gets a URL that can be used for resolving whether a captive portal is present.
      * 1. This URL should respond with a 204 response to a GET request to indicate no captive
      *    portal is present.
      * 2. This URL must be HTTP as redirect responses are used to find captive portal
      *    sign-in pages. Captive portals cannot respond to HTTPS requests with redirects.
      *
+     * The system network validation may be using different strategies to detect captive portals,
+     * so this method does not necessarily return a URL used by the system. It only returns a URL
+     * that may be relevant for other components trying to detect captive portals.
      * @hide
      */
     @SystemApi
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 52fcd4a968..49d8c2d0d3 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -6685,7 +6685,9 @@ public class ConnectivityService extends IConnectivityManager.Stub
     @Override
     public String getCaptivePortalServerUrl() {
         enforceConnectivityInternalPermission();
-        return NetworkMonitorUtils.getCaptivePortalServerHttpUrl(mContext);
+        final String defaultUrl = mContext.getResources().getString(
+                R.string.config_networkDefaultCaptivePortalServerUrl);
+        return NetworkMonitorUtils.getCaptivePortalServerHttpUrl(mContext, defaultUrl);
     }
 
     @Override