+ * `<success request="auth"><user>?user_name?</name></success>`:
+ authentication was successfull. ?user_name? is name of authenticated user.
+
+ * `<success request="newuser"><user>?user_name?</name></success>`:
+ new user addition was successfull. ?user_name? is name of newly added user.
+
+ * `<success request="changepass"><user>?user_name?</name></success>`:
+ password change was successfull. ?user_name? is name user whose password
+ has been changed.