callback example

function intentHandler (session, other, stuff, callback) {
    // some random stuff...
    request.post({options: "duh",}, {body: "duh",}, function (e0, r0, b0) { 
        // Now you know that post has returned, do the get stuff you needed
        request.get({otherOptions: "duh",}, function (e1, r1, b1) {
            // Now you know that get has returned, do the stuff you need.
            callback(
                sessionAttributes,
                buildSpeechletResponseCard(
                    cardTitle,
                    speechOutput,
                    cardOutput,
                    repromptText,
                    shouldEndSession
                )
            );
        });
    });
}

extracted post callback example

makePost(callback) {
    request.post(options, body, function(e, r, b) {
        callback(e, r, b);
    });
}

function intentHandlerWithPost (session, other, stuff, callback) {
    makePost(function(e, r, b) {
        // Now you know that post has returned, do the get stuff you needed
        request.get({otherOptions: "duh",}, function (e1, r1, b1) {
            // Now you know that get has returned, do the stuff you need.
            callback(
                sessionAttributes,
                buildSpeechletResponseCard(
                    cardTitle,
                    speechOutput,
                    cardOutput,
                    repromptText,
                    shouldEndSession
                )
            );
        });
    });
}