class Bundler::RubygemsIntegration::Future

def fetch_specs(source, remote, name)
  path = source + "#{name}.#{Gem.marshal_version}.gz"
  fetcher = gem_remote_fetcher
  fetcher.headers = { "X-Gemfile-Source" => remote.original_uri.to_s } if remote.original_uri
  string = fetcher.fetch_path(path)
  Bundler.load_marshal(string)
rescue Gem::RemoteFetcher::FetchError => e
  # it's okay for prerelease to fail
  raise e unless name == "prerelease_specs"
end