diff --git a/app/services/zip_service.rb b/app/services/zip_service.rb
index 3cdeb2f6..5dd2caba 100755
--- a/app/services/zip_service.rb
+++ b/app/services/zip_service.rb
@@ -184,6 +184,7 @@ module ZipService
 
   def export_user_exercise exercise, exercise_user, file_name
     url = Setting.protocol + "://" + Setting.host_name + "/exercise/" + exercise.id.to_s + "/show_student_result?user_id=#{exercise_user.user_id}&pdf=1"
+    Rails.logger.info("#########################url: #{url}")
     kit = PDFKit.new(url, :page_size => "A4")
     # kit.to_pdf # inline PDF
     # file_name = "#{exercise.course_id}-#{exercise.exercise_name}-#{exercise_user.user.user_extensions.student_id}-#{exercise_user.user.show_real_name}" + ".pdf"