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server {

	 listen 80;
	 server_name a.chenshaowen.com;
	 location / {
			proxy_pass http://A;
	 }
 }

server {

	listen 8080;
	server_name b.chenshaowen.com;
	location / {
		   proxy_pass http://B;
	}
}

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server {
	  listen 80;
	  server_name XX.chenshaowen.com;
	  return 404;
 }
 # 其他 server

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yum install httpd-tools

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htpasswd -bc /your/password/file/path username password

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location / {
	   auth_basic "input password";
	   auth_basic_user_file  /your/password/file/path;
	   ...
 }

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nginx -s reload
```

当再次访问时，Nginx 会弹出一个小框，提示输入密码。使用 username:password 即可登录、