A Program Logic problem in a sub-station of Baidu caused dos Attacks

Http://tcfile.baidu.com/index.php? Url = url this url is designed to provide a mobile phone user with an interface to access a web page on the computer for traffic. However, this page has a problem when obtaining the corresponding content of the url. Improper timeout settings in combination with the php script will lead to a severe dos index. when the php captures the url page, It redirects to the 302 of the follow http. If the redirection address is the page itself, the index. php will send the same request to its own server POC: http://tcfile.baidu.com/index.php? Url = http: // somesite/somepage where the php code for http: // somesite/sompage is <? Php header ("Location: http://tcfile.baidu.com/index.php? Url = http: // somesite/somepage ");?> This is a normal page
This is a DOS attack. When server resources are exhausted, the http link is terminated.

 Solution:

Many methods can be used to set php connection timeout, cache, and repeated requests to not respond.