Action
's subclasses no longer need to worry about any plumbing logout code.Q。他们将只包含正常的业务逻辑代码。清?是基cȝ部分代码Q?br>User agents often have history mechanisms, such as "Back" buttons and history lists, which can be used to redisplay an entity retrieved earlier in a session.q运的是Q用微软的IE和基于Mozilla的浏览器用户多余Opera览器。上面讲q的解决Ҏ对大多数用户来说q是有帮助的。另外,无论是否使用上述的解x案,Opera览器仍然存在用户退出问题,Opera来说没有M改变。然而,正如RFC2616中所_通过像上面一栯|头文g指oQ当用户点击一个链接时QOpera览器不会从~存中获取页面?br>History mechanisms and caches are different. In particular history mechanisms SHOULD NOT try to show a semantically transparent view of the current state of a resource. Rather, a history mechanism is meant to show exactly what the user saw at the time when the resource was retrieved.