My spas-simple modification to support passing through a header object.

api.js

var request = require("request"),
	_ = require("underscore")._;

/*
	# Simple API Request
*/

exports["request"] = function(params, credentials, cb) {
	
	var reqString = params.url,
		first = true;
	
	_.each(params, function(val, key) {
		if(key !== 'url' && key !== 'headers') {
			reqString += first ? '?' : '&';
			reqString += key + '=' + val;
			first = false;
		}
	});
	
	request({url:reqString,headers:params.headers}, function (err, res, body) {
		if (!err && res.statusCode == 200) {
			cb(null, JSON.parse(body))
		} else {
			var result;
			try {
				result = JSON.parse(body);
			} catch(e) {
				result = {errnum:1, errtxt:"req failed"}
			} finally {
				cb(result );	
			}
		}
	});
	
}