to_args (OpenID::Message)

    # File lib/openid/message.rb, line 253
        def to_args
          post_args = self.to_post_args
          kvargs = {}
          post_args.each { |k,v|
            if !k.starts_with?('openid.')
              raise ArgumentError, "This message can only be encoded as a POST, because it contains arguments that are not prefixed with 'openid.'"
            else
              kvargs[k[7..-1]] = v
            end
          }
          return kvargs
        end