服务器根本不需要发回任何响应正文，所以你不必担心客户端下载数据。
The server doesn't have to send back any response body at all, so you don't have to worry about downloading data to the client.
ok值，指示服务器成功处理了客户端的请求并将请求的资源包括在响应正文中。
OK indicates that the server successfully processed the client's request and included the requested resource in the response body.
它负责发送响应正文中的一部分数据，可以多次调用此方法以发送正文中多个连续的部分。
This sends a chunk of the response body. This method may be called multiple times to provide successive parts of the body.
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