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。
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");。
Life is like a fable, its value is not the length, but in content.
生命如同寓言，其价值不在于长短，而在于内容。
Life is not measured by its length, but by its content.
生活不由它的长短来衡量，而由它的内容来衡量。
It is not measured by its length, but by its content.
它并不是由它的长短来衡量，而是由它的内容来衡量。
Life is like a fable, its value is not in the length, and the content.
Seneca生命如同寓言，其价值不在长短，而在内容。
"Long march" the text length is very short, but a lot of content.
《长征》这篇课文篇幅很短，但内容很多。
Content_Length the length of the content, as given by the client.
内容的长度，与客户机给出的相同。
Content_Length the length of the content, as given by the client.
内容的长度，与客户机给出的相同。
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