diff --git a/lib/hanami/action/mime.rb b/lib/hanami/action/mime.rb
index 56706d7a..abccc7af 100644
--- a/lib/hanami/action/mime.rb
+++ b/lib/hanami/action/mime.rb
@@ -15,6 +15,8 @@ module Mime # rubocop:disable Metrics/ModuleLength
       TYPES = {
         txt: "text/plain",
         html: "text/html",
+        form: "application/x-www-form-urlencoded",
+        multipart: "multipart/form-data",
         json: "application/json",
         manifest: "text/cache-manifest",
         atom: "application/atom+xml",