diff --git a/framework/api/current.txt b/framework/api/current.txt
index 243e4ca..f22d4b7 100644
--- a/framework/api/current.txt
+++ b/framework/api/current.txt
@@ -87,6 +87,7 @@
     method @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE) public boolean isActiveNetworkMetered();
     method public boolean isDefaultNetworkActive();
     method @Deprecated public static boolean isNetworkTypeValid(int);
+    method public void registerBestMatchingNetworkCallback(@NonNull android.net.NetworkRequest, @NonNull android.net.ConnectivityManager.NetworkCallback, @NonNull android.os.Handler);
     method @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE) public void registerDefaultNetworkCallback(@NonNull android.net.ConnectivityManager.NetworkCallback);
     method @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE) public void registerDefaultNetworkCallback(@NonNull android.net.ConnectivityManager.NetworkCallback, @NonNull android.os.Handler);
     method @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE) public void registerNetworkCallback(@NonNull android.net.NetworkRequest, @NonNull android.net.ConnectivityManager.NetworkCallback);
diff --git a/framework/src/android/net/ConnectivityManager.java b/framework/src/android/net/ConnectivityManager.java
index ff07ee4..59d2131 100644
--- a/framework/src/android/net/ConnectivityManager.java
+++ b/framework/src/android/net/ConnectivityManager.java
@@ -18,8 +18,8 @@
 import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
 import static android.net.NetworkRequest.Type.BACKGROUND_REQUEST;
 import static android.net.NetworkRequest.Type.LISTEN;
+import static android.net.NetworkRequest.Type.LISTEN_FOR_BEST;
 import static android.net.NetworkRequest.Type.REQUEST;
-import static android.net.NetworkRequest.Type.TRACK_BEST;
 import static android.net.NetworkRequest.Type.TRACK_DEFAULT;
 import static android.net.NetworkRequest.Type.TRACK_SYSTEM_DEFAULT;
 import static android.net.QosCallback.QosCallbackRegistrationException;
@@ -4269,15 +4269,33 @@
     }
 
     /**
-     * @hide
+     * Registers to receive notifications about the best matching network which satisfy the given
+     * {@link NetworkRequest}.  The callbacks will continue to be called until
+     * either the application exits or {@link #unregisterNetworkCallback(NetworkCallback)} is
+     * called.
+     *
+     * <p>To avoid performance issues due to apps leaking callbacks, the system will limit the
+     * number of outstanding requests to 100 per app (identified by their UID), shared with
+     * {@link #registerNetworkCallback} and its variants and {@link #requestNetwork} as well as
+     * {@link ConnectivityDiagnosticsManager#registerConnectivityDiagnosticsCallback}.
+     * Requesting a network with this method will count toward this limit. If this limit is
+     * exceeded, an exception will be thrown. To avoid hitting this issue and to conserve resources,
+     * make sure to unregister the callbacks with
+     * {@link #unregisterNetworkCallback(NetworkCallback)}.
+     *
+     *
+     * @param request {@link NetworkRequest} describing this request.
+     * @param networkCallback The {@link NetworkCallback} that the system will call as suitable
+     *                        networks change state.
+     * @param handler {@link Handler} to specify the thread upon which the callback will be invoked.
+     * @throws RuntimeException if the app already has too many callbacks registered.
      */
-    // TODO: Make it public api.
     @SuppressLint("ExecutorRegistration")
     public void registerBestMatchingNetworkCallback(@NonNull NetworkRequest request,
             @NonNull NetworkCallback networkCallback, @NonNull Handler handler) {
         final NetworkCapabilities nc = request.networkCapabilities;
         final CallbackHandler cbHandler = new CallbackHandler(handler);
-        sendRequestForNetwork(nc, networkCallback, 0, TRACK_BEST, TYPE_NONE, cbHandler);
+        sendRequestForNetwork(nc, networkCallback, 0, LISTEN_FOR_BEST, TYPE_NONE, cbHandler);
     }
 
     /**
diff --git a/framework/src/android/net/Network.java b/framework/src/android/net/Network.java
index 46141e0..7245db3 100644
--- a/framework/src/android/net/Network.java
+++ b/framework/src/android/net/Network.java
@@ -30,10 +30,10 @@
 import android.util.proto.ProtoOutputStream;
 
 import com.android.internal.annotations.GuardedBy;
-import com.android.okhttp.internalandroidapi.Dns;
-import com.android.okhttp.internalandroidapi.HttpURLConnectionFactory;
 
 import libcore.io.IoUtils;
+import libcore.net.http.Dns;
+import libcore.net.http.HttpURLConnectionFactory;
 
 import java.io.FileDescriptor;
 import java.io.IOException;
@@ -299,7 +299,7 @@
         // Set configuration on the HttpURLConnectionFactory that will be good for all
         // connections created by this Network. Configuration that might vary is left
         // until openConnection() and passed as arguments.
-        HttpURLConnectionFactory urlConnectionFactory = new HttpURLConnectionFactory();
+        HttpURLConnectionFactory urlConnectionFactory = HttpURLConnectionFactory.createInstance();
         urlConnectionFactory.setDns(dnsLookup); // Let traffic go via dnsLookup
         // A private connection pool just for this Network.
         urlConnectionFactory.setNewConnectionPool(httpMaxConnections,
diff --git a/framework/src/android/net/NetworkRequest.java b/framework/src/android/net/NetworkRequest.java
index 3fd95ee..dbe3ecc 100644
--- a/framework/src/android/net/NetworkRequest.java
+++ b/framework/src/android/net/NetworkRequest.java
@@ -140,7 +140,7 @@
         REQUEST,
         BACKGROUND_REQUEST,
         TRACK_SYSTEM_DEFAULT,
-        TRACK_BEST,
+        LISTEN_FOR_BEST,
     };
 
     /**
@@ -514,6 +514,15 @@
     }
 
     /**
+     * Returns true iff. this NetworkRequest is of type LISTEN_FOR_BEST.
+     *
+     * @hide
+     */
+    public boolean isListenForBest() {
+        return type == Type.LISTEN_FOR_BEST;
+    }
+
+    /**
      * Returns true iff. the contained NetworkRequest is one that:
      *
      *     - should be associated with at most one satisfying network
diff --git a/framework/src/android/net/VpnTransportInfo.java b/framework/src/android/net/VpnTransportInfo.java
index c510079..cd8f4c0 100644
--- a/framework/src/android/net/VpnTransportInfo.java
+++ b/framework/src/android/net/VpnTransportInfo.java
@@ -22,9 +22,6 @@
 import android.annotation.SystemApi;
 import android.os.Parcel;
 import android.os.Parcelable;
-import android.util.SparseArray;
-
-import com.android.internal.util.MessageUtils;
 
 import java.util.Objects;
 
@@ -38,9 +35,6 @@
  */
 @SystemApi(client = MODULE_LIBRARIES)
 public final class VpnTransportInfo implements TransportInfo, Parcelable {
-    private static final SparseArray<String> sTypeToString =
-            MessageUtils.findMessageNames(new Class[]{VpnManager.class}, new String[]{"TYPE_VPN_"});
-
     /** Type of this VPN. */
     public final int type;
 
@@ -63,8 +57,7 @@
 
     @Override
     public String toString() {
-        final String typeString = sTypeToString.get(type, "VPN_TYPE_???");
-        return String.format("VpnTransportInfo{%s}", typeString);
+        return String.format("VpnTransportInfo{type=%d}", type);
     }
 
     @Override