To watch the HTTP headers in action, let's build, install, and run an HTTP reverse proxy to cache the output of a small PHP application.
要查看HTTP报头如何工作，让我们构建、安装并运行一个HTTP反向代理来缓存一个小型PHP应用程序的输出。
Of course, if an application confidently does something that a user doesn't like, it must have the capability to reverse the operation. Every aspect of the program's action must be undoable.
当然，如果程序自信地做了用户不乐意的事，必须有能力执行撤销操作，程序行为的每个方面都必须是可撤销的。
Reverse jet action distance, can use long big filter bag, make full use of space, cover an area of an area small.
反吹风作用距离大，可采用长滤袋，充分利用空间，占地面积小。
To reverse the action of an engine.
用逆火的方式爆裂或发出逆火的声音。
To reverse the action of an engine.
用逆火的方式爆裂或发出逆火的声音。
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