Internet servers are always in danger of being "hijacked" by various attacks like the buffer overflow attack. Although there are many researches to protect servers from such attacks, preventing all types of attacks is difficult because most of attacks are caused by programming errors of servers. Therefore, imposing access restrictions on servers is still needed so that it minimizes damages by hijacking. Since practical servers need various access restrictions to handle various requests, they have to not only impose but remove access restrictions.
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