用户就可能认为程序反应缓慢，或者认为浏览器出了故障。
Users might think the program is sluggish, or that the browser is malfunctioning.
异步请求的不可靠性对于自动保存来说还是可以接受的，因为实现自动保存的作用只是在浏览器瘫痪或网络故障时进行部分恢复。
The unreliable nature of the asynchronous requests is acceptable for auto-saving because this is implemented only to partially recover from a browser crash or network failure.
如果服务器发生了故障，会话状态就丢失了，那么用户就会体验到非常奇怪的浏览器行为“为什么我又回到主页上来了？”
If a server fails, the session state goes away and users experience odd browser behavior " Why am I back to the home page?"
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