# File lib/bundler/source.rb, line 7
    def self.mirror_for(uri)
      uri = URI(uri.to_s) unless uri.is_a?(URI)

      # Settings keys are all downcased
      mirrors = Bundler.settings.gem_mirrors
      normalized_key = URI(uri.to_s.downcase)

      mirrors[normalized_key] || uri
    end