proxy_pass check if 404, and return 404 (3 replies)

I am using proxy_pass to a dynamic subdomain:

proxy_pass https://$remote_user.mydomain.io

Is it possible to have the proxy_pass check if the response of https://$remote_user.mydomain.io is 404, if so, simply do:

return 404;

I.E. don't proxy, immediately return.