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return function (req, res, go)
-- Skip this layer for clients who don't send User-Agent headers.
local userAgent = req.headers["user-agent"]
if not userAgent then return go() end
-- Run all inner layers first.
go()
-- And then log after everything is done
--print(string.format("%s %s %s %s", req.method, req.path, userAgent, res.code))
end
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