[系统运维]10.如何防止未定义的服务器名处理请求

官网：How nginx processes a request

翻译部分：?How to prevent processing requests with undefined server names

开始！

If requests without the “Host” header field should not be allowed, a server that just drops the requests can be defined:

如果不允许请求没有host头字段?，可以定义一个只删除请求的服务器，如下：

server {
    listen      80;
    server_name "";
    return      444;
}

Here, the server name is set to an empty string that will match requests without the “Host” header field, and a special nginx’s non-standard code 444 is returned that closes the connection.

这里，server_name被设置为""?(一个空字符串)的服务器将匹配没有带host头字段的请求，且返回一个特殊的nginx的非标准状态码444来关闭链接。

Since version 0.8.48, this is the default setting for the server name, so the? server_name ""?can be omitted. In earlier versions, the machine’s? hostname?was used as a default server name.

?自0.8.48版本以来，这是server_name的默认配置,所以server_name ""可以被忽略。在更早的版本中，机器的主机名被用作默认的服务器名。