class Falcon::Adapters::Output

def self.wrap(status, headers, body)
	# In no circumstance do we want this header propagating out:
	if length = headers.delete(CONTENT_LENGTH)
		# We don't really trust the user to provide the right length to the transport.
		length = Integer(length)
	end
	
	if body.is_a?(Async::HTTP::Body::Readable)
		return body
	elsif status == 200 and body.respond_to?(:to_path)
		# Don't mangle partial responsese (206)
		return Async::HTTP::Body::File.open(body.to_path)
	elsif body.is_a? Array
		# TODO after dropping 2.3, change to #sum
		length ||= body.inject(0){|sum, chunk| sum + chunk.bytesize}
		return self.new(headers, body, length)
	else
		return self.new(headers, body, length)
	end
end