The configuration below can be added inside a server{} block inside an NGINX configuration file to redirect any requests for files in wp-content/uploads that don’t exist back to the live server, www.example.com.

server {

# ... other server configuration... 

    # Match anything in wp-content/uploads and if it doesn't exist, use the rule for @prod_serv
    location ~ "^(.*)/wp-content/uploads/(.*)$" {
        try_files $uri @prod_server;
    }

    # Send a temporary http redirect to the browser, redirecting the request to 
    # For a permanent redirect change the status code below from 302 to 301
    location @prod_serv {
        return 302 $scheme://www.example.com$request_uri;
    }

# ... rest of the server config below ...
}

This solution was based on the information at http://wordpress.stackexchange.com/a/215189 and https://www.nginx.com/blog/creating-nginx-rewrite-rules/ .

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