Rails - Jan 2011 - actionpack-3.0.3/lib/action_dispatch/middleware/rescue.rb

I was trying to understand how exceptions are caught.  There are two
rescue.rb files.  One is under ActionController.  I understand how it is
invoked and what it does.  But the one under action_dispatch I don''t
see
how it gets used.

I see the autoload for it in actionpack-3.0.3/lib/action_dispatch.rb but
I don''t see a Rescue class created anywhere.

Can someone help me to understand this part of the code?

Thank you in advance.

Perry

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