twitst4tz

twitter statistics web application
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xmlhttprequest.js (1241B)

      1 // browser shim for xmlhttprequest module
      2 
      3 var hasCORS = require('has-cors');
      4 var globalThis = require('./globalThis');
      5 
      6 module.exports = function (opts) {
      7   var xdomain = opts.xdomain;
      8 
      9   // scheme must be same when usign XDomainRequest
     10   // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
     11   var xscheme = opts.xscheme;
     12 
     13   // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
     14   // https://github.com/Automattic/engine.io-client/pull/217
     15   var enablesXDR = opts.enablesXDR;
     16 
     17   // XMLHttpRequest can be disabled on IE
     18   try {
     19     if ('undefined' !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
     20       return new XMLHttpRequest();
     21     }
     22   } catch (e) { }
     23 
     24   // Use XDomainRequest for IE8 if enablesXDR is true
     25   // because loading bar keeps flashing when using jsonp-polling
     26   // https://github.com/yujiosaka/socke.io-ie8-loading-example
     27   try {
     28     if ('undefined' !== typeof XDomainRequest && !xscheme && enablesXDR) {
     29       return new XDomainRequest();
     30     }
     31   } catch (e) { }
     32 
     33   if (!xdomain) {
     34     try {
     35       return new globalThis[['Active'].concat('Object').join('X')]('Microsoft.XMLHTTP');
     36     } catch (e) { }
     37   }
     38 };