require('Memcached') local args = ngx.req.get_uri_args()   if (ngx.var.remote_addr == '192.168.1.5') then         local key = args['k']         local class = args['c']         local key = class..':'..key           local memcache = Memcached.Connect('127.0.0.1', 11212)         if (memcache:add(key,1))         then                 memcache:get(key)         else                 memcache:incr(key);                 ngx.print(memcache:get(key))         end else         ngx.exit(404) end