`nix-serve` does not handle duplicates in the path: ``` hut$ curl http://127.0.0.1:5000/nix-cache-info StoreDir: /nix/store WantMassQuery: 1 Priority: 30 hut$ curl http://127.0.0.1:5000//nix-cache-info File not found. ``` This meant that the cache was not accessible via: `curl https://jungle.bsc.es/cache/nix-cache-info` but `curl https://jungle.bsc.es/cachenix-cache-info` worked. Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>