HTTP如何指定传输编码响应的结束：分块？

从这个wikipedia example 一个典型的HTTP响应可能看起来像这样HTTP如何指定传输编码响应的结束：分块？

HTTP/1.1 200 OK 
Date: Mon, 23 May 2005 22:38:34 GMT 
Content-Type: text/html; charset=UTF-8 
Content-Encoding: UTF-8 
Content-Length: 138 
Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT 
Server: Apache/1.3.3.7 (Unix) (Red-Hat/Linux) 
ETag: "3f80f-1b6-3e1cb03b" 
Accept-Ranges: bytes 
Connection: close 

<html> 
<head> 
    <title>An Example Page</title> 
</head> 
<body> 
    Hello World, this is a very simple HTML document. 
</body> 
</html>

在这种情况下，因为这个头的：