nginx.conf

server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # 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;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    # CSP violation reporting (Issue #831). `report-to` supersedes `report-uri`
    # in modern browsers; both point at the same same-origin collector.
    add_header Reporting-Endpoints 'csp-endpoint="/api/security/csp-report"' always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'sha256-2cZtek/4Mta9v4mtLkqsK+tSR0rUJ9LWlEhKKvL5/Ts='; style-src 'self' https://fonts.googleapis.com; connect-src 'self' https://*.stellar.org wss://*.stellar.org https://*.sorobanrpc.com https://api.coingecko.com wss://*.walletconnect.com https://*.walletconnect.com https://*.walletconnect.org; img-src 'self' data: https:; font-src 'self' https://fonts.gstatic.com; frame-src 'self' https://albedo.link https://*.albedo.link; object-src 'none'; base-uri 'self'; upgrade-insecure-requests; report-uri /api/security/csp-report; report-to csp-endpoint;" always;

    # Health check endpoint
    location /health {
        return 200 'ok';
        add_header Content-Type text/plain;
    }

    # Keep the runtime kill switch same-origin and available without rebuilding the UI.
    location /api/ {
        proxy_pass http://api:4000/api/;
        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_connect_timeout 2s;
        proxy_read_timeout 10s;
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # SPA fallback — all routes serve index.html
    location / {
        try_files $uri $uri/ /index.html;
    }
}