Props @Aliso, https://github.com/aliso/vvv-site-wizard/blob/master/vvv#L383

site.conf

# Directives to send expires headers and turn off 404 error logging.
location ~* \.(js|css|png|jpe?g|gif|ico)$ {
    expires 24h;
    log_not_found off;
    try_files $uri $uri/ @production;
}

location @production {
    resolver 8.8.8.8;
    proxy_pass http://example.com/$uri;
}