微信开发者工具1.03.2012121版本在调试公众号网页时跨域，1.03.2011120版本不存在这样的问题，访问的是同一个网址

Access to XMLHttpRequest at 'http://xxxx' from origin 'http://xxx' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.