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shrine-medco/shrine-webclient/src/main/html/node_modules/engine.io-client/lib/xmlhttprequest.js
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xmlhttprequest.js
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			// browser shim for xmlhttprequest module
			var hasCORS = require('has-cors');

			module.exports = function(opts) {
			var xdomain = opts.xdomain;

			// scheme must be same when usign XDomainRequest
			// http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
			var xscheme = opts.xscheme;

			// XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
			// https://github.com/Automattic/engine.io-client/pull/217
			var enablesXDR = opts.enablesXDR;

			// XMLHttpRequest can be disabled on IE
			try {
			if ('undefined' != typeof XMLHttpRequest && (!xdomain \|\| hasCORS)) {
			return new XMLHttpRequest();
			}
			} catch (e) { }

			// Use XDomainRequest for IE8 if enablesXDR is true
			// because loading bar keeps flashing when using jsonp-polling
			// https://github.com/yujiosaka/socke.io-ie8-loading-example
			try {
			if ('undefined' != typeof XDomainRequest && !xscheme && enablesXDR) {
			return new XDomainRequest();
			}
			} catch (e) { }

			if (!xdomain) {
			try {
			return new ActiveXObject('Microsoft.XMLHTTP');
			} catch(e) { }
			}
			}