# File lib/stomp/connection.rb, line 311
    def unsubscribe(dest, headers = {}, subId = nil)
      raise Stomp::Error::NoCurrentConnection if closed?
      headers = headers.symbolize_keys
      headers[:destination] = dest
      if @protocol >= Stomp::SPL_11
        raise Stomp::Error::SubscriptionRequiredError if (headers[:id].nil? && subId.nil?)
      end
      _headerCheck(headers)
      transmit(Stomp::CMD_UNSUBSCRIBE, headers)
      if @reliable
        subId = dest if subId.nil?
        @subscriptions.delete(subId)
      end
    end