访问淘宝出现 malformed header: "charset=gb2312\r\n"

非必现，不定时随机出现，不同域名都有遇到过

[DEBUG] 2015/01/29 10:24:46 connPool channel s.taobao.com:80: put back conn
[DEBUG] 2015/01/29 10:24:46 connPool channel s.taobao.com:80: put back conn
[DEBUG] 2015/01/29 10:24:46 connPool channel suggest.taobao.com:80: put back conn
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) connected, total 36 clients
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) connPool no conn detail.tmall.com:80
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) connected to detail.tmall.com:80 1 concurrent connections
[ERROR] 2015/01/29 10:24:47 split header malformed header: "charset=gb2312\r\n"
line: charset=gb2312

raw header:
HTTP/1.1 200 OK
Content-Type: text/html
Cache-Control: no-cache
Expires: epoch

[ERROR] 2015/01/29 10:24:47 parse response header: malformed header: "charset=gb2312\r\n" GET detail.tmall.com:80/item.htm?id=********
HTTP/1.1 200 OK
Content-Type: text/html
Cache-Control: no-cache
Expires: epoch
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) server read error parse response errors.errorString malformed header: "charset=gb2312\r\n" GET detail.tmall.com:80/item.htm?id=*******
[DEBUG] 2015/01/29 10:24:47 close connection to detail.tmall.com:80 remains 0 concurrent connections
[DEBUG] 2015/01/29 10:24:47 connPool channel gm.mmstat.com:80: put back conn
[DEBUG] 2015/01/29 10:24:47 connPool channel gm.mmstat.com:80: put back conn
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) connPool no conn detail.tmall.com:80
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) connected to detail.tmall.com:80 1 concurrent connections
[DEBUG] 2015/01/29 10:24:47 cli(127.0.0.1:53696) connPool put detail.tmall.com:80
[DEBUG] 2015/01/29 10:24:47 connPool channel detail.tmall.com:80: put conn
[DEBUG] 2015/01/29 10:24:48 connPool channel detail.tmall.com:80: put back conn
[DEBUG] 2015/01/29 10:24:48 connPool channel g.tbcdn.cn:80: close one conn

或许和联通 120.52.73.x 的CDN有关系?