查看web日志发现部分请求地址后带了个参数?qq-pf-to=pcqq.c2c

godamen

18.249.94.2 - - [12/Nov/2013:14:35:41 +0800] "GET /xxx.html HTTP/1.1" 200 8901 "http://www.xxx.comxxx.html?qq-pf-to=pcqq.group" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.92 Safari/537.1 LBBROWSER" 218.249.94.2
113.140.86.66 - - [12/Nov/2013:14:35:47 +0800] "GET /?qq-pf-to=pcqq.c2c HTTP/1.0" 200 835643 "-" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.1 (KHTML, like Gecko) Maxthon/4.1.3.5000 Chrome/26.0.1410.43 Safari/537.1" 113.140.86.66
123.151.163.247 - - [12/Nov/2013:14:35:37 +0800] "GET /xxx.html?qq-pf-to=pcqq.c2c HTTP/1.1" 200 9095 "-" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.43 BIDUBrowser/2.x Safari/537.31" 123.151.163.247
114.213.10.33 - - [12/Nov/2013:14:35:51 +0800] "GET /xxx.php HTTP/1.0" 200 2000 "http://www.xxx.com/deadline/?qq-pf-to=pcqq.c2c" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" 114.213.10.33
221.204.199.111 - - [12/Nov/2013:14:35:47 +0800] "GET /xxx.html?qq-pf-to=pcqq.c2c HTTP/1.1" 200 31613 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" 221.204.199.111
222.76.205.130 - - [12/Nov/2013:14:35:57 +0800] "GET /xxx/?qq-pf-to=pcqq.c2c HTTP/1.0" 200 37058 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" 222.76.205.130
223.128.1.58 - - [12/Nov/2013:14:36:08 +0800] "GET /xxx.html?qq-pf-to=pcqq.c2c HTTP/1.1" 200 8300 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" 223.128.1.58


?qq-pf-to=pcqq.c2c 这个是浏览器自已带上去的?有什么用?