class Bundler::RubygemsIntegration::Future

def download_gem(spec, uri, path)
  require 'resolv'
  uri = Bundler::Source.mirror_for(uri)
  proxy, dns = configuration[:http_proxy], Resolv::DNS.new
  fetcher = Gem::RemoteFetcher.new(proxy, dns)
  fetcher.download(spec, uri, path)
end