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module Rack
class BodyProxy
def initialize(body, &block)
@body, @block, @closed = body, block, false
end
def respond_to?(*args)
super or @body.respond_to?(*args)
end
def close
raise IOError, "closed stream" if @closed
begin
@body.close if @body.respond_to? :close
ensure
@block.call
@closed = true
end
end
def closed?
@closed
end
def method_missing(*args, &block)
@body.__send__(*args, &block)
end
end
end
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