The server has to respond to the request and figure out a response to populate the content-length response header, so you don't save any processing time.
服务器必须对请求进行响应，并构造一个响应来填充内容长度的响应头，因此并不能节省任何处理时间。
It then validates that it has proper type of JSON, and that the content-type response header is JSON.
然后验证是否有适当类型的JSON，并验证内容类型响应标头是否为JSON。
The browser has a built-in cache that stores responses for HTTP requests according to caching information provided in the header of the HTTP response.
浏览器具有内置缓存，用于根据HTTP响应的标头中提供的信息存储HTTP请求的响应。
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