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

   1
   2 /**
   3  * Module dependencies.
   4  */
   5
   6 var XHR = require('./polling-xhr');
   7 var JSONP = require('./polling-jsonp');
   8
   9 /**
  10  * Export transports.
  11  */
  12
  13 module.exports = exports = {
  14   polling: polling,
  15   websocket: require('./websocket')
  16 };
  17
  18 /**
  19  * Export upgrades map.
  20  */
  21
  22 exports.polling.upgradesTo = ['websocket'];
  23
  24 /**
  25  * Polling polymorphic constructor.
  26  *
  27  * @api private
  28  */
  29
  30 function polling (req) {
  31   if ('string' === typeof req._query.j) {
  32     return new JSONP(req);
  33   } else {
  34     return new XHR(req);
  35   }
  36 }