auth.lua

local count = 0
core.register_service("auth", "http", function (applet)
        count = count + 1
        -- Get X-Auth-Token --
        local token = applet.headers['x-auth-token'][0]

        local cmd = 'curl -H "X-Auth-Token:'..token..'"'
        cmd = cmd..' -sL -w "%{http_code}\\n"'
        cmd = cmd..' "https://staging.identity-internal.api.rackspacecloud.com/v2.0/tokens/'..token..'"'
        cmd = cmd..'  -o /dev/null'

        print(os.time())
        local output = io.popen(cmd)
        local result = output:read()
        output:close()
        print(os.time())
        print('----')
        print(count)
        if (result == 200) then
                applet:set_status(200)
        else
                applet:set_status(403)
        end

        local response = ""
        applet:add_header("content-length", string.len(response))
        applet:add_header("content-type", "text/plain")
        applet:start_response()
        applet:send(response)
end)

ha.conf

global
	lua-load auth.lua

listen http_in
	http-request use-service lua.auth
	bind *:8080
	mode http
	timeout connect 5000
	timeout client  50000
	timeout server  50000