srvrevproxy02_nginx/sites-available/owa.conf

add_header X-Robots-Tag "noindex, nofollow, nosnippet, noarchive";

# Optimized cache paths
proxy_cache_path /var/cache/nginx/kopano levels=1:2 keys_zone=kopano_static:10m 
                 max_size=2g inactive=24h use_temp_path=off;

# Upstream with connection pooling
upstream kopano_backend {
    server 10.0.0.21:443;
    keepalive 32;
    keepalive_requests 1000;
    keepalive_timeout 60s;
}

# WebSocket support map
map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

server {
    listen 80;
    server_name owa.egonetix.de autodiscover.egonetix.de mail.egonetix.de;
    return 301 https://$server_name$request_uri;
}

server {
    listen 10.0.0.29:443 ssl http2;
    
    # SSL config
    ssl_certificate /etc/letsencrypt/live/owa.egonetix.de/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/owa.egonetix.de/privkey.pem;
    ssl_dhparam /etc/ssl/certs/dhparam.pem;
    
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    
    server_name owa.egonetix.de autodiscover.egonetix.de mail.egonetix.de;
    
    access_log /var/log/nginx/owa-access_log;
    error_log /var/log/nginx/owa-error_log;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 5;
    gzip_types text/plain text/css text/xml text/javascript 
               application/json application/javascript application/xml+rss 
               application/x-javascript image/svg+xml;
    gzip_min_length 1000;
    
    # Default proxy settings
    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 X-Forwarded-Host $host;
    proxy_set_header Connection "";
    proxy_ssl_session_reuse on;
    proxy_ssl_server_name on;
    
    rewrite ^/$ /webapp redirect;
    
    # Static files - aggressive caching
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        proxy_pass https://kopano_backend;
        proxy_cache kopano_static;
        proxy_cache_valid 200 24h;
        proxy_cache_valid 404 1m;
        expires 24h;
        add_header Cache-Control "public, immutable";
        
        # Buffering for static files
        proxy_buffering on;
        proxy_buffer_size 8k;
        proxy_buffers 32 8k;
    }
    
    # WebApp - DISABLE buffering for AJAX responsiveness
    location /webapp {
        proxy_pass https://kopano_backend;
        
        # NO caching
        proxy_no_cache 1;
        proxy_cache_bypass 1;
        
        # DISABLE buffering for instant AJAX responses
        proxy_buffering off;
        
        proxy_read_timeout 300s;
        client_max_body_size 100M;
        proxy_redirect off;
    }
    
    # ActiveSync - disable buffering for real-time sync
    location /Microsoft-Server-ActiveSync {
        proxy_pass https://kopano_backend;
        
        proxy_no_cache 1;
        proxy_cache_bypass 1;
        proxy_buffering off;
        
        proxy_read_timeout 3660s;
        client_max_body_size 100M;
        proxy_redirect off;
    }
    
    # WebMeetings - WebSocket support
    location /webmeetings {
        proxy_pass https://kopano_backend;
        
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        
        proxy_buffering off;
        proxy_read_timeout 7200s;
        client_max_body_size 500M;
        proxy_redirect off;
    }
    
    # Autodiscover
    location ~* /Autodiscover/Autodiscover.xml {
        access_log /var/log/nginx/z-push-autodiscover-access.log;
        error_log /var/log/nginx/z-push-autodiscover-error.log;
        
        proxy_pass https://kopano_backend;
        proxy_no_cache 1;
        proxy_cache_bypass 1;
        proxy_buffering off;
        proxy_read_timeout 60s;
        client_max_body_size 10M;
        proxy_redirect off;
    }
    
    # OWA compatibility
    location /owa {
        proxy_pass https://kopano_backend;
        
        proxy_no_cache 1;
        proxy_cache_bypass 1;
        proxy_buffering off;
        
        proxy_read_timeout 300s;
        client_max_body_size 100M;
        proxy_redirect off;
    }
    
    # CalDAV
    location /caldav {
        proxy_pass http://10.0.0.21:8080;
        
        proxy_no_cache 1;
        proxy_cache_bypass 1;
        proxy_buffering off;
        
        proxy_read_timeout 300s;
        client_max_body_size 50M;
        proxy_redirect off;
    }
}