# File lib/httparty/net_digest_auth.rb, line 21
      def authorization_header
        @cnonce = md5(random)
        header = [%Q(Digest username="#{@username}"),
          %Q(realm="#{@response['realm']}"),
          %Q(nonce="#{@response['nonce']}"),
          %Q(uri="#{@path}"),
          %Q(response="#{request_digest}")]
        [%Q(cnonce="#{@cnonce}"),
          %Q(opaque="#{@response['opaque']}"),
          %Q(qop="#{@response['qop']}"),
          %Q(nc="0")].each { |field| header << field } if qop_present?
        header
      end