Nodejs loop http requests in a function - node.js

Question

I have been able to use bluebird to run an array of http get requests in parallel within a function that returns the responses of each requests after they have all finished. However, I would like to chain the requests in sequence to run one after another without effecting the asynchronous behavior of the promises in my current function shown below.
var Promise = require('bluebird');
function buildCartWithItems(cartID,requests, cookie) {
var promises = [];
for (idx in requests) {
var request = requests[idx]; // requests is an array containing the json records of each request parameter
request["id"] = cartID;
promises.push(new Promise(function(resolve, reject) {
var options = {
host: 'example.com',
path: "/example/addToCart?"+param(request),
headers: {'Cookie': cookie, 'Connection': 'keep-alive'}
};
https.get(options, function (response) {
var body = '';
response.on('data', function(d) {
body += d;
});
response.on('end', function() {
console.log("jsonservicesPostRequest response: " + body);
var parsed = JSON.parse(body);
if (parsed["STATUS"] == "success") {
resolve(parsed.RESULT.itemGroup.id);
} else
resolve("error");
});
response.on('error', function(exception) {
console.log("auth error: " + exception);
resolve(exception);
});
});
}));
}
return Promise.all(promises);
}
Use:
var cart = 12345; // cart ID
var itemsParams = [];
for (idx in products) {
var parms = {
'guid' : prod["_id"]["GUID"],
'count': prod["deficit"],
};
itemsParams.push(parms);
}
buildCartWithItems(cart,itemsParams,newcookie).then(function(results) {
// results -> array of all of the cart.id's
console.log("Build Cart Results: " + JSON.stringify(results));
});