conns_.push_back(new_connection);
it->acceptor_->async_accept(new_connection->socket(),
boost::bind(&SyncServer::handle_accept, this, new_connection, boost::asio::placeholders::error, it));
conns_.push_back(new_connection);
it->acceptor_->async_accept(new_connection->socket(),
boost::bind(&SyncServer::handle_accept, this, new_connection, boost::asio::placeholders::error, it));