In this method, we get the Content-Length from the header in the response object.

此方法中，我们从响应对象的头部获取Content - Length。

youdao

So to get the length of a response, just call request.getResponseHeader("Content-Length");.

因此要获取响应的长度，只需要调用 request.getResponseHeader("Content-Length");。

youdao

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。

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