Titanium setHeader failed

equal_cookie.js

var xhr = Titanium.Network.createHTTPClient();
xhr.open('GET','http://192.168.1.28:8080');
xhr.setRequestHeader('Accept','application/json');
xhr.setRequestHeader('Cookie','MSISAuth=v1==');
xhr.send();

Run Emulator console:
[ERROR] invalid arguments for setting cookie. value should be in the format 'name=value'. in -[TiNetworkHTTPClientProxy setRequestHeader:] (TiNetworkHTTPClientProxy.m:374)
[ERROR] The application has crashed with an unhandled exception. Stack trace: