Rails - Jul 2013 - How to handle exception that is generated in rack middleware before it reach rails app?

I know that we can use config.exception_app to set up custom exception 
handling and also use rescue_from. However, I have an issue that there is 
malformed request (testing generated request) that caused Rails Rack 
middleware to throw an exception when Rack''s parse_query method.  Here
is
the detail of the 
problem:
http://stackoverflow.com/questions/17796878/how-to-handle-exception-generated-from-rack-before-reaching-your-rails-app

The issue is that it failed in rails Rack::MethodOverride with is 
before ActionDispatch::ShowExceptions middleware and way before it even got 
to the rails app.

So how do we handle the exception gracefully without showing the stack 
trace?

Thanks for your help.

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