pleroma/installation/pleroma.nginx

proxy_cache_path /tmp/pleroma-media-cache levels=1:2 keys_zone=pleroma_media_cache:10m max_size=10g
                 inactive=720m use_temp_path=off;

server {
       listen         80;
       server_name    example.tld;
       return         301 https://$server_name$request_uri;
}

server {
    listen 443 ssl http2;
    ssl on;
    ssl_session_timeout 5m;

    ssl_certificate           /etc/letsencrypt/live/exmaple.tld/fullchain.pem;
    ssl_certificate_key       /etc/letsencrypt/live/example.tld/privkey.pem;

    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers "HIGH:!aNULL:!MD5 or HIGH:!aNULL:!MD5:!3DES";
    ssl_prefer_server_ciphers on;

    server_name example.tld;

    gzip_vary on;                                                                                                                         
    gzip_proxied any;                                                                                                                     
    gzip_comp_level 6;                                                                                                                    
    gzip_buffers 16 8k;                                                                                                                   
    gzip_http_version 1.1;                                                                                                                
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript application/activity+json application/atom+xml;      
    location / {
        # if you do not want remote frontends to be able to access your Pleroma backend
        # server, remove these lines.
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'POST, GET, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type' always;
        if ($request_method = OPTIONS) {
            return 204;
        }
        # stop removing lines here.

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_host;

        proxy_pass http://localhost:4000;
    }

    location /proxy {
        proxy_cache pleroma_media_cache;
        proxy_cache_lock on;
        proxy_pass http://localhost:4000;
    }

}