Syntax:set $variable value;
Default:—
Context:server, location, if

# 将http://www.ayitula.com  重写为 http://www.ayitula.com/baism
location / {set $name baism;rewrite ^(.*)$ http://www.ayitula.com/$name;}

Syntax: if (condition) { … }
Default: —
Context: server, location条件匹配#模糊匹配~匹配!~不匹配~* 不区分大小写的匹配#精确匹配=!=

location / {root html;index index.html index.htm;if ($http_user_agent ~* 'Chrome') {break;return 403;#return http://www.jd.com;}
}

Syntax:     return code [text];return code URL;　　return URL;Default: —
Context: server, location, if

location / {root html;index index.html index.htm;if ($http_user_agent ~* 'Chrome') {return 403;#return http://www.jd.com;}
}

停止执行当前虚拟主机的后续rewrite指令集
Syntax:break;Default:—Context:server, location, if

location / {root html;index index.html index.htm;if ($http_user_agent ~* 'Chrome') {break;return 403;}
}

域名跳转
# www.ayitula.com     重写为  www.jd.com
server {listen        80;server_name www.ayitula.com;location / {rewrite ^/$ http://www.jd.com permanent;}
}

域名跳转
www.ayitula.com     重写为  www.jd.com
server {listen        80;server_name www.ayitula.com;location / {rewrite ^/$ http://www.jd.com redirect;}
}

域名跳转
www.ayitula.com     重写为  www.jd.com
server {listen        80;server_name www.ayitula.com;location / {rewrite ^/$ http://www.jd.com break;}
}

如果是chrome浏览器  就将
http://192.168.10.42/$URI重写为
http://http://192.168.10.42/chrome/$URI
实现 步骤
1)URL重写
2)请求转给本机location
location / {
.....
if ($http_user_agent ~* 'chrome'){#^ 以什么开头 ^a#$ 以什么结尾 c$#. 除了回车以外的任意一个字符#* 前面的字符可以出现多次或者不出现#更多内容看正则表达式 rerewrite ^(.*)$ /chrome/$1 last;}location /chrome {root html ;index index.html;}
}