root 和 alias 的区别

参考：https://stackoverflow.com/questions/10631933/nginx-static-file-serving-confusion-with-root-alias

• root
• the location part is appended to root part
• final path = root + location
• alias
• the location part is replaced by the alias part

• final path = alias

• root 举例

location /static/ {
    root /var/www/app/static/;
    autoindex off;
}

final path = /var/www/app/static/ + /static/ = /var/www/app/static/static

• alias 举例

location /static/ {
    alias /var/www/app/static/;
    autoindex off;
}

final path = /var/www/app/static/ 替换 /static = /var/www/app/static