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Using it like following, it doesn't work.
config.middleware.use RackAfterReply do |env|
env['rack_after_reply.callbacks'] << lambda { }
And running the rake:
rake middleware -t
/Users/millisami/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `block in require': iconv will be deprecated in the future, use String#encode instead.
** Invoke middleware (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
undefined method `new' for RackAfterReply:Module
/Users/millisami/.rvm/gems/ruby-1.9.3-p0/gems/actionpack-3.1.3/lib/action_dispatch/middleware/stack.rb:43:in `build'
/Users/millisami/.rvm/gems/ruby-1.9.3-p0/gems/actionpack-3.1.3/lib/action_dispatch/middleware/stack.rb:112:in `block in build'
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