apache的timeout为何不起作用？

CODE:

请求头1
GET /loginbox.php HTTP/1.1
Accept: */*
Referer: http://www.chinaunix.net/
Accept-Language: zh-cn
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon)
Host: bbs.chinaunix.net
Connection: Keep-Alive
Cookie: XXXXXXXXXXXXXXXXXX

回复头1
HTTP/1.1 200 OK
Date: Mon, 11 Jun 2007 04:38:57 GMT
Server: Apache/2.0.54 (Unix) PHP/5.2.0
X-Powered-By: PHP/5.2.0
Cache-Control: no-cache, must-revalidate
Pragma: no-cache
Content-Length: 1420
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=GB2312



回复内容1
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{timeout 是这段时间}

请求头2
GET /viewthread.php?tid=947518 HTTP/1.1
Accept: */*
Referer: http://www.chinaunix.net/
Accept-Language: zh-cn
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon)
Host: bbs.chinaunix.net
Connection: Keep-Alive
Cookie:

回复头2
HTTP/1.1 200 OK
Date: Mon, 11 Jun 2007 04:39:03 GMT
Server: Apache/2.0.54 (Unix) PHP/5.2.0
X-Powered-By: PHP/5.2.0
Set-Cookie: XXXXXXXXXXXXXXXXXX
Set-Cookie: XXXXXXXXXXXXXXXXXX
Set-Cookie: XXXXXXXXXXXXXXXXXX
Set-Cookie: XXXXXXXXXXXXXXXXXX
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=GB2312

回复内容2
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