LearnBoost/engine.io-client — pull request #54 by mixu (2012-09-25 18:43:50+00:00)
Title: Prefer XMLHttpRequest over XDomainRequest in IE10

E.g. if and only if XHR has withCredentials, which is the case for IE10 but not earlier IE versions.

http://msdn.microsoft.com/en-us/library/ie/hh872883(v=vs.85).aspx