local uri = ngx.unescape_uri(ngx.var.arg_uri)
local secret = ngx.var.upt_secret
local duration = ngx.var.upt_duration
local etime = os.time() + duration
local sign = ngx.md5(secret .. '&' .. etime .. '&' .. uri)
ngx.log(ngx.ERR, 'sign...' .. sign .. ' etime..' .. etime)
local upt = string.sub(sign, 13, 13 + 7) .. etime
ngx.say(upt)