求大神指点，访问百度、verycd、oschina 等网站出现 302，但是 ping 是没有问题的

最近一段时间访问百度、 verycd 、 oschina 等网站出现 302 ，但是 ping 是没有问题的。不论是 WIFI 还是有线，无一不是 302...

使用 fiddler2 抓包结果如下：

edge 浏览器：

GET http://www.baidu.com/index.php?tn=mswin_oem_dg HTTP/1.1
Accept: text/html, application/xhtml+xml, image/jxr, */*
Accept-Language: zh-Hans-CN,zh-Hans;q=0.8,en-US;q=0.5,en;q=0.3
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64 ) AppleWebKit/537.36 (KHTML, like Gecko ) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240
Accept-Encoding: gzip, deflate
DNT: 1
Host: www.baidu.com
Connection: Keep-Alive
Cookie: BAIDUID=5347AAF194C48A498F6CA71A3B18F4E7:FG=1; BIDUPSID=5347AAF194C48A498F6CA71A3B18F4E7; PSTM=1438868195; BDRCVFR[bLbo9QmdyQn]=aeXf-1x8UdYcs; BD_LAST_QID=16798790746009251183

HTTP/1.1 302 Moved Temporarily
Date: Wed, 02 Sep 2015 15:22:40 GMT
Content-Type: text/html
Content-Length: 215
Connection: Keep-Alive
Set-Cookie: BDRCVFR[bLbo9QmdyQn]=aeXf-1x8UdYcs; path=/; domain=.baidu.com
Set-Cookie: BD_LAST_QID=17768487627213785721; path=/; Max-Age=1
P3P: CP=" OTI DSP COR IVA OUR IND COM "
Location: https://www.baidu.com/index.php?tn=mswin_oem_dg
Server: BWS/1.1
X-UA-Compatible: IE=Edge,chrome=1

<html>
<head><title>302 Found</title></head>
<body bgcolor="white">
<center><h1>302 Found</h1></center>
<hr><center>pr-nginx_1-0-244_BRANCH Branch
Time : Mon Aug 24 14:55:36 CST 2015</center>
</body>
</html>

chrome 浏览器：

GET http://www.baidu.com/ HTTP/1.1
Host: www.baidu.com
Connection: keep-alive
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64 ) AppleWebKit/537.36 (KHTML, like Gecko ) Chrome/43.0.2357.134 Safari/537.36
DNT: 1
Accept-Encoding: gzip, deflate, sdch
Accept-Language: zh-CN,zh;q=0.8
Cookie: BAIDUID=0EC51BBDB390148A685AE8EB3B1D5884:FG=1; BIDUPSID=0EC51BBDB390148A685AE8EB3B1D5884; BDUSS=1JZZUstYnhoUkhCanZIT0ctY243R3pHMXN2ZEY3cURVQ1RBUHR0OTFybU90SXBWQVFBQUFBJCQAAAAAAAAAAAEAAAATSKgWTXVycGh5TAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAI4nY1WOJ2NVM; PSTM=1432649891; ispeed_lsm=2; BD_UPN=12314753

HTTP/1.1 302 Moved Temporarily
Date: Wed, 02 Sep 2015 15:24:28 GMT
Content-Type: text/html
Content-Length: 215
Connection: Keep-Alive
Location: https://www.baidu.com/
Server: BWS/1.1
X-UA-Compatible: IE=Edge,chrome=1
Set-Cookie: BD_LAST_QID=13215679850863398944; path=/; Max-Age=1

<html>
<head><title>302 Found</title></head>
<body bgcolor="white">
<center><h1>302 Found</h1></center>
<hr><center>pr-nginx_1-0-244_BRANCH Branch
Time : Mon Aug 24 14:55:36 CST 2015</center>
</body>
</html>