Tried a simple proxy pass in a pointer location ( location @foobar. Proxy pass). Tried a redirect with, of course, no luck. Seemingly must be proxied since the resource is behind the network.
With Nginx, it is possible to route a specific error to a named location using an error_page directive. For example:
location / {
error_page 404 = @other;
# other configuration...
}
location @other {
proxy_pass https://www.digitalocean.com;
}
With this configuration, if a page is not found the request is proxied to https://www.digitalocean.com. Of course, in a real situation, that would likely be a service on a different port or instance altogether.