use dup._call for thread safety
use dup._call for thread safety

carstengehling/route_downcaser,substancelab/route_downcaser,marleyspoon/route_downcaser,marleyspoon/route_downcaser,substancelab/route_downcaser,carstengehling/route_downcaser,substancelab/route_downcaser,carstengehling/route_downcaser,marleyspoon/route_downcaser