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node_modules/engine.io/lib/transports/index.js

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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);
+  }
+}