1 files changed, 6 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/params_parser.rb b/actionpack/lib/action_dispatch/middleware/params_parser.rb
index e83cf9236b..ff2b2fe74b 100644
--- a/actionpack/lib/action_dispatch/middleware/params_parser.rb
+++ b/actionpack/lib/action_dispatch/middleware/params_parser.rb
@@ -47,6 +47,8 @@ module ActionDispatch
             false
         end
       rescue Exception => e # YAML, XML or Ruby code block errors
+        logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"
+
         raise
           { "body" => request.raw_post,
             "content_type" => request.content_type,
@@ -67,5 +69,9 @@ module ActionDispatch
 
         nil
       end
+
+      def logger
+        defined?(Rails.logger) ? Rails.logger : Logger.new($stderr)
+      end
   end
 end