摘要： 带下划线的二级域名, IE无法读取session和cookie, firefox/chrome等都可以.域名规范中确实不允许有下划线。RFC 952明确规定“A "name" (Net, Host, Gateway, or Domain name) is a text string up to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus sign (-), and period (.). Note that periods are only allowed when they serve 阅读全文