map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name etherpad.zinomedia.de;

    # TLS (yours)
    ssl_certificate /etc/letsencrypt/live/etherpad.zinomedia.de/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/etherpad.zinomedia.de/privkey.pem;

    # Optional basic auth
    auth_basic "Protected";
    auth_basic_user_file /usr/share/nginx/html/etherpad.zinomedia.de/.htpasswd;

    # Docker DNS for container name resolution
    resolver 127.0.0.11 valid=30s ipv6=off;

    # 1) Pass-through for static, admin, socket.io, etc.  (no friendly rewrite)
    location ~ ^/(locales/|locales\.json|admin/|static/|pluginfw/|javascripts/|socket\.io/|ep/|minified/|api/|ro/|error/|jserror/|favicon\.ico|robots\.txt|.*\.js)$ {
        set $upstream "http://etherpad:9001";
        proxy_pass $upstream;
        proxy_buffering off;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade; # websockets
        proxy_set_header Connection $connection_upgrade;
        proxy_pass_header Server;
    }

    # 2) /p/... -> internally rewrite to /..., then proxy (NO redirect!)
    location /p/ {
        rewrite ^/p/(.*)$ /$1 break;
        set $upstream "http://etherpad:9001";
        proxy_pass $upstream;
        proxy_buffering off;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_pass_header Server;
    }

    # 3) Home page
    location = / {
        set $upstream "http://etherpad:9001";
        proxy_pass $upstream;
        proxy_buffering off;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_pass_header Server;
    }

    # 4) Everything else (pad URLs): keep browser at /<pad>, but let upstream redirect to /p/<pad>
    location / {
        # Important: map upstream Location: /p/...  -->  client sees /
        proxy_redirect /p/ /;
        set $upstream "http://etherpad:9001";
        proxy_pass $upstream;
        proxy_buffering off;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_pass_header Server;
    }
}

server {
    listen 80;
    listen [::]:80;
    server_name etherpad.zinomedia.de;
    return 301 https://$host$request_uri;
}