介绍子域名的建设和使用（前提是主域名已经正确解析到服务器ip）
首先在DNS解析网站添加一个CNAME，在主机或子域名字段中输入你想要的子域名前缀，在目标或指向字段中输入 starry0214.one（这是我的主域名）（例如你想要使用子域名web_chat，则实际访问链接为web_chat.starry0214.one），示例如下：
相关使用方法：
此处我想通过将所有访问我子域名（web_chat.starry0214.one）的流量全部转发至端口9999，因为我在端口9999部署了一个web项目。在完成了子域名解析后，在服务器的Nginx配置文件添加如下server块代码实现流量处理转发：
server {
listen 9999;
server_name web_chat.starry0214.one;
location / {
proxy_pass http://localhost:9999;
proxy_set_header Host $host;
}
}
/*listen 9999的9999应该替换为你想要的且没被占用的端口， server_name后面替换为你的完整子域名， proxy_pass http://localhost:9999中9999替换为你想要的目标窗口，最后一行不变*/保存并重启Nginx后，访问你的子域名，就会达到你服务器目标端口下的对应项目。
多个server块中的listen端口可以重复，只要确保server_name不同即可
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