Object Storage redirect on file object missing (404 not found)?

I’m looking for a way to create an image resize service based on DO Object Storage.

Is it possible to froward all image requests to the storage and when the file is not found redirect request to the resizing backend?

It’s similar to the Nginx config:

 # check if image already exists 
 location ~ /(\d+x\d+/.*) {
    try_files /$1 @img;
  # This saves the resized image locally.
  location @img {    
    proxy_pass $full_uri;
    proxy_store /var/www/cache/store/img/$full_uri;

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You can set Nginx to intercept errors returned by the service behind it and specify how to handle those 404 errors coming from upstream in order to redirect.

This thread includes some good configuration examples for intercepting errors with Nginx proxy_pass.