def filter_request(request)
      @filters.each do |filter|
        request = filter.filter(request)
        return nil if request.nil?
      end
      request
    end
def filter_request(request)
      @filters.each do |filter|
        request = filter.filter(request)
        return nil if request.nil?
      end
      request
    end
Push a request through the entire filterchain (@filters).
 <tt>request</tt> The request to filter.
 Returns the filtered request or nil.