react-router-ga/example/node_modules/sockjs-client/lib/transport/xdr-streaming.js

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'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , XhrReceiver = require('./receiver/xhr')
  , XDRObject = require('./sender/xdr')
  ;

// According to:
//   http://stackoverflow.com/questions/1641507/detect-browser-support-for-cross-domain-xmlhttprequests
//   http://hacks.mozilla.org/2009/07/cross-site-xmlhttprequest-with-cors/

function XdrStreamingTransport(transUrl) {
  if (!XDRObject.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/xhr_streaming', XhrReceiver, XDRObject);
}

inherits(XdrStreamingTransport, AjaxBasedTransport);

XdrStreamingTransport.enabled = function(info) {
  if (info.cookie_needed || info.nullOrigin) {
    return false;
  }
  return XDRObject.enabled && info.sameScheme;
};

XdrStreamingTransport.transportName = 'xdr-streaming';
XdrStreamingTransport.roundTrips = 2; // preflight, ajax

module.exports = XdrStreamingTransport;