When the current site's images return a 404 error, Nginx automatically serves images from the backup site.

You can use the following Nginx configuration to automatically fetch images from a backup site when a 404 error is encountered for an image on this site:

http {
    upstream backup_images {
        server backup.example.com;
    }

    server {
        listen 80;
        server_name example.com;
        root /var/www/html;

        location /images/ {
            try_files $uri @backup;
        }

        location @backup {
            proxy_pass http://backup_images;
        }
    }
}

This configuration willexample.com的80Listen on the port and forward all requests to/var/www/htmlIn the directory. All/images/The initial request will be processed. If the image requested by this site does not exist,NginxThe system will automatically forward the request to the backup site.backup.example.comRetrieve images from a backup site.

Note that this configuration is being used.upstreamUse a module to define a backup site. If yourNginxThe version does not come with built-in functionality.upstreamThe module requires manual compilation.NginxTurn onupstreamModule. Additionally, due to the presence of a proxy, the backup site must be configured.CORSStrategy – Allowexample.comOtherwise, the browser will reject the request for images from the backup site.