Render the SELECT control for the cascading drop-down control
为级联式下拉控件呈现 SELECT 控件
2
If server C is down, the Web browser will not be able to correctly render all the pages because some information will be missing, and error messages will pollute the overall page rendering.
如果服务器 C 已关闭，Web 浏览器将无法正确地呈现所有页面，因为将缺少某些信息，而错误消息将影响总体页面呈现。
3
Understanding controllers boils down to the three rs: return, redirect, and render.