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/**
* Module dependencies.
*/
var XHR = require('./polling-xhr');
var JSONP = require('./polling-jsonp');
/**
* Export transports.
*/
module.exports = exports = {
polling: polling,
websocket: require('./websocket')
};
/**
* Export upgrades map.
*/
exports.polling.upgradesTo = ['websocket'];
/**
* Polling polymorphic constructor.
*
* @api private
*/
function polling (req) {
if ('string' === typeof req._query.j) {
return new JSONP(req);
} else {
return new XHR(req);
}
}