lib/grape/router.rb in grape-2.1.0 vs lib/grape/router.rb in grape-2.1.1

@@ -136,10 +136,11 @@
       compile! unless compiled
       yield || default_response
     end
 
     def default_response
-      [404, { Grape::Http::Headers::X_CASCADE => 'pass' }, ['404 Not Found']]
+      headers = Grape::Util::Header.new.merge(Grape::Http::Headers::X_CASCADE => 'pass')
+      [404, headers, ['404 Not Found']]
     end
 
     def match?(input, method)
       @optimized_map[method].match(input) { |m| @map[method].detect { |route| m[route.regexp_capture_index] } }
     end