After a network request has been completed, the stack writes the response to the cache.
一个网络上的请求完成以后，堆栈把响应的结果写入到缓存。
When the user makes a request, the client stack first checks the file cache for a response before going over the network.
当用户发送来一个请求时，客户端堆栈在把这个请求转发到网络上之前首先查找文件缓存。
Traverse the network stack to accept the inbound request.
遍历网络堆栈，以接受入站请求。
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