using request library directly, works fine

gistfile1.txt

    var request = require("request");  

    var apis = {bitfinex: "https://api.bitfinex.com/v1/pubticker/btcusd",
    		bitstamp: "https://www.bitstamp.net/api/ticker/"};
    
    async.map([ "bitfinex", "bitstamp"], 
    function(item, callback) {
    	request(apis[item], function(err,resp,  body) {
    		return callback(err, body);
    	});
    }, function(err, results) {
    	console.log(results);
    });

    ['{"mid":"281.65",
       "bid":"281.64",
       "ask":"281.66",
       "last_price":"281.66",
       "low":"246.59",
       "high":"315.0",
       "volume":"167070.1841004",
       "timestamp":"1422285023.994555452"}',
      '{"high": "309.90", 
        "last": "278.84", 
    	"timestamp": "1422285014", 
    	"bid": "278.84", 
    	"vwap": "280.37", 
    	"volume": "49768.45795621", 
    	"low": "246.00", 
    	"ask": "279.55"}']