def warmup(version = nil, cache_path = nil)
      if cache_path.nil?
        warmup_from_cdn(version)
      else
        warmup_from_files(version, cache_path)
      end
    end
def warmup(version = nil, cache_path = nil)
      if cache_path.nil?
        warmup_from_cdn(version)
      else
        warmup_from_files(version, cache_path)
      end
    end
Warms up cache from CDN or local files