# File lib/rack/static.rb, line 40
    def call(env)
      path = env["PATH_INFO"]

      unless @urls.kind_of? Hash
        can_serve = @urls.any? { |url| path.index(url) == 0 }
      else
        can_serve = @urls.key? path
      end

      if can_serve
        env["PATH_INFO"] = @urls[path] if @urls.kind_of? Hash
        @file_server.call(env)
      else
        @app.call(env)
      end
    end