Refs #259 (#260)

cyu · Mar 16, 2023 · bd99f4c · bd99f4c
1 parent d47d6a3
commit bd99f4c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/rack/cors/resource.rb b/lib/rack/cors/resource.rb
@@ -66,7 +66,7 @@ def to_headers(env)
           'access-control-max-age' => max_age.to_s
         }
         h['access-control-allow-credentials'] = 'true' if credentials
-        h
+        Gem.loaded_specs['rack'].version >= Gem::Version.new('3') ? h : Rack::Utils::HeaderHash.new(h)
       end
 
       protected