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docs/self-hosting/nginx.md

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+# Deploy with Nginx
+
+Host BentoPDF on your own server using Nginx.
+
+## Prerequisites
+
+- Ubuntu/Debian server
+- Nginx installed
+- SSL certificate (recommended: Let's Encrypt)
+
+## Step 1: Build the Project
+
+```bash
+git clone https://github.com/alam00000/bentopdf.git
+cd bentopdf
+npm install
+npm run build
+```
+
+To customize branding, set environment variables before building:
+
+```bash
+VITE_BRAND_NAME="AcmePDF" VITE_BRAND_LOGO="images/acme-logo.svg" npm run build
+```
+
+## Step 2: Copy Files
+
+```bash
+sudo mkdir -p /var/www/bentopdf
+sudo cp -r dist/* /var/www/bentopdf/
+sudo chown -R www-data:www-data /var/www/bentopdf
+```
+
+## Step 3: Nginx Configuration
+
+Create `/etc/nginx/sites-available/bentopdf`:
+
+```nginx
+server {
+    listen 80;
+    server_name your-domain.com;
+    return 301 https://$server_name$request_uri;
+}
+
+server {
+    listen 443 ssl http2;
+    server_name your-domain.com;
+
+    # SSL Configuration
+    ssl_certificate /etc/letsencrypt/live/your-domain.com/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/your-domain.com/privkey.pem;
+
+    root /var/www/bentopdf;
+    index index.html;
+
+    # Gzip compression
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/wasm;
+    gzip_min_length 1000;
+
+    # WASM MIME type
+    types {
+        application/wasm wasm;
+    }
+
+    # Required headers for SharedArrayBuffer (LibreOffice WASM)
+    # These must be on every response - especially HTML pages
+    add_header Cross-Origin-Embedder-Policy "require-corp" always;
+    add_header Cross-Origin-Opener-Policy "same-origin" always;
+    add_header Cross-Origin-Resource-Policy "cross-origin" always;
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+
+    # Pre-compressed LibreOffice WASM binary
+    location ~* /libreoffice-wasm/soffice\.wasm\.gz$ {
+        gzip off;
+        types {} default_type application/wasm;
+        add_header Content-Encoding gzip;
+        add_header Cache-Control "public, immutable";
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+    }
+
+    # Pre-compressed LibreOffice WASM data
+    location ~* /libreoffice-wasm/soffice\.data\.gz$ {
+        gzip off;
+        types {} default_type application/octet-stream;
+        add_header Content-Encoding gzip;
+        add_header Cache-Control "public, immutable";
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+    }
+
+    # Cache static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|wasm)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+    }
+
+    # SPA routing - serve index.html for all routes
+    location / {
+        try_files $uri $uri/ /index.html;
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+    }
+}
+```
+
+## Step 4: Enable the Site
+
+```bash
+sudo ln -s /etc/nginx/sites-available/bentopdf /etc/nginx/sites-enabled/
+sudo nginx -t
+sudo systemctl reload nginx
+```
+
+## Step 5: SSL with Let's Encrypt
+
+```bash
+sudo apt install certbot python3-certbot-nginx
+sudo certbot --nginx -d your-domain.com
+```
+
+## Subdirectory Deployment
+
+To host at `/pdf/`:
+
+```nginx
+location /pdf/ {
+    alias /var/www/bentopdf/;
+    try_files $uri $uri/ /pdf/index.html;
+}
+```
+
+Build with:
+
+```bash
+BASE_URL=/pdf/ npm run build
+```
+
+## Performance Tuning
+
+Add to `nginx.conf`:
+
+```nginx
+http {
+    # Enable sendfile
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+
+    # Increase buffer sizes
+    client_max_body_size 100M;
+
+    # Worker connections
+    worker_connections 2048;
+}
+```
+
+## Troubleshooting
+
+### WASM Not Loading
+
+Ensure MIME type is set:
+
+```nginx
+types {
+    application/wasm wasm;
+}
+```
+
+### Word/ODT/Excel to PDF Not Working
+
+LibreOffice WASM requires `SharedArrayBuffer`, which needs `Cross-Origin-Embedder-Policy` and `Cross-Origin-Opener-Policy` headers. Note that nginx `add_header` directives in a `location` block **override** server-level `add_header` directives — they don't merge. Every `location` block with its own `add_header` must include the COEP/COOP headers.
+
+Verify with:
+
+```bash
+curl -I https://your-domain.com/ | grep -i cross-origin
+```
+
+If using a reverse proxy in front of nginx, ensure it preserves these headers.
+
+### 502 Bad Gateway
+
+Check Nginx error logs:
+
+```bash
+sudo tail -f /var/log/nginx/error.log
+```