location ~* ^/(wp-content/uploads/images/(S1.jpg|S2.jpg|S3.jpg|logo.png)|favicon.ico)$ {
    set $stripped_host $host;

    if ($host ~* ^www\.(.*)) {
        set $stripped_host $1;
    }

    proxy_pass http://54.39.16.232:80; 
    proxy_set_header Host "vertical-site.com"; 
    proxy_set_header X-Real-IP $remote_addr; 
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
    proxy_set_header REMOTE-HOST $remote_addr; 
    proxy_set_header Upgrade $http_upgrade; 
    proxy_set_header Connection "upgrade"; 
    proxy_set_header X-Forwarded-Proto $scheme; 
    proxy_http_version 1.1; 
    add_header X-Cache $upstream_cache_status; 
    add_header Cache-Control no-cache; 

    proxy_set_header X-Forwarded-Host "$stripped_host";
}