gravatar.conf

# Gravatar
location = /robots.txt {
    add_header Content-Type text/plain;
    return 200 "User-agent: *\nDisallow: /\n";
}
location ~ ^/.*/.*$
{
    proxy_pass https://s.gravatar.com;
    proxy_hide_header Access-Control-Allow-Origin;
    proxy_hide_header Strict-Transport-Security;
    proxy_hide_header Cache-Control;
    proxy_set_header Host s.gravatar.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 Accept-Encoding "";
    proxy_ssl_session_reuse off;
    proxy_ssl_server_name on;
    resolver 8.8.8.8 ipv6=off;
    add_header Access-Control-Allow-Origin *;
    # Set Nginx Cache
    proxy_ignore_headers Set-Cookie Cache-Control expires;
    proxy_cache cache_one;
    proxy_cache_key $host$uri$is_args$args;
    proxy_cache_valid 200 304 301 302 7d;
    expires 7d;
    add_header AdminCDN-Cache $upstream_cache_status;
    add_header Cache-Control no-cache;
}