Nginx图片处理

server {
  # ...此处省略N行配置
  # example: /thumb/[md5].png_300x187.png
  location ~ "/thumb/([0-9a-f]{32}\.(png|jpg|gif))_(\d+|-)x(\d+|-)\.(png|jpg|gif)$" {
    access_log off;
    set $image $1;
    set $width $3;
    set $height $4;
    # 建议使用try_files代替if
    try_files /thumb/$image =404;
    image_filter resize $width $height;
    image_filter_buffer 10M;
    # 只会在浏览器端缓存，若要在服务器端缓存，可采用proxy的方案(此处没有给出，可自行google)
    expires 7d;
  }
}