AJAX的工作原理是深入到服务器内部，然后按需求将内容抓取出来，这一过程中你无需更新页面内容。
AJAX works by reaching into a server and pulling content out to display on demand, without having to refresh the web page.
此时，客户机需要解析并修改文件，然后传输回服务器，这种模式的工作原理是什么？
At this point, the client has to parse and modify the file for transmission back to the server. How might this type of scheme work?
身份验证流程与凭据交换的工作原理完全相同，与要验证服务器还是要验证客户端无关。
The authentication process and credential exchange work exactly the same regardless of whether it is the server or client being authenticated.
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