But these conditions aside, the "receive request, send file" process is fairly efficient.
但是，除了这些状况之外，“接收请求，发送文件”过程还是相当高效的。
The request will be received by the back end, which in turn will send back a JSON response file containing the requested data to the device.
请求将被后端接收到，然后回送一个 JSON 响应文件，其中含有设备请求的数据。
The client might send a request for a cached file to the server only to receive a 304 Not Modified reply.
客户端可以向服务器发送针对某个缓存文件的请求，并且只会接收到一个304 Not Modified回复。
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