resize image according to query string

nginx.conf

#
# The image server
#

proxy_cache_path /tmp/nginx-images-cache/ levels=1:2 keys_zone=images:10m inactive=24h max_size=100m;

upstream image_8083 {
    server 127.0.0.1:8083  max_fails=3     fail_timeout=2s;
}

server {
    listen                                          *:8086;
    listen                                          *:80;
#    server_name  _;
    merge_slashes off;

    client_max_body_size 4m;
    client_body_buffer_size 128k;

    chunked_transfer_encoding on;

    access_log      /var/log/nginx/car_8086.log  main;

    root /root/image/www;

    index index.html;
    autoindex on;

    location /resize {
        alias /tmp/nginx/resize;
        index on;
        set $width 200;
        set $height 150;

        if ($uri ~* "^/resize/(\d+)x(\d+)/(.*)" ) {
                set $width  $1;
                set $height $2;
                set $image_path $3;
        }
        set $image_uri $image_path?w=$width&h=$height;

        proxy_pass http://127.0.0.1:8087/$image_uri;
        proxy_cache images;
        proxy_cache_valid 200 24h;

    }

    location / {
      try_files $uri $uri/ @rewrites;
    }

    location @rewrites {
      rewrite ^(.+)$ /index.html last;
    }

    location /api {
            chunked_transfer_encoding on;
            proxy_set_header                Host            $host;
            proxy_set_header                X-Real-Ip       $remote_addr;
            proxy_pass                      http://image_8083/api;
    }

}

server {
    # Internal image resizing server.
    listen 8087;
    # server_name  localhost;
    root /root/image/www;
    merge_slashes off;

    location /upload {
        alias /root/image/www/upload;
        image_filter resize $arg_w $arg_h;
        image_filter_jpeg_quality 90;
        image_filter_buffer 8M;
    }
}