HTTP / 1.1客户端如何知道消息在“Connection：keep-alive”头字段存在的情况下结束但是没有“Content-Length”？

How does a HTTP/1.1 client know where a message ends in presence of `Connection: keep-alive` header field but absence of `Content-Length`?

特别是，我有一个来自nginx服务器的响应头：

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HTTP/1.1 200 OK
Server: nginx/1.10.3 (Ubuntu)
Date: Tue, 20 Mar 2018 10:28:24 GMT
Content-Type: text/html
Last-Modified: Thu, 28 Jan 2016 10:50:21 GMT
Connection: keep-alive
ETag: W/"56a9f26d-2d97"
Content-Encoding: gzip

然后是大约3352字节的压缩数据。我正在尝试找出客户机如何知道消息体的结束位置和新的响应开始。