Saving QuickBlox chat history using JS

i try to save chat history on server side by using JS. With no luck.

According to SDK i need to use extension: {save_to_history: 1}

But i don't understand where to use it, so XML request will be correct.

Here is an code from JS chat example:

message = {
            message: post,
            name: chatUser.name,
            avatar: chatUser.avatar,
            fb: chatUser.fbID
        };
        message = Strophe.escapeNode(JSON.stringify(message));

        if (userJID) {
            params = {
                to: userJID,
                from: connection.jid,
                type: 'chat'
            };
            connection.send($msg(params).c('body').t(message));

Plz advice!