proxy_pass http://backend:8000;
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 $forwarded_proto;

# Security headers (repeated per location — nginx add_header in a location block
# overrides server-level directives, so all headers must be explicit)
add_header Cache-Control "no-store, no-cache, must-revalidate" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; img-src 'self' data:; font-src 'self' https://fonts.gstatic.com; connect-src 'self'; frame-ancestors 'none'; upgrade-insecure-requests;" always;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), interest-cohort=(), publickey-credentials-get=(self), publickey-credentials-create=(self)" always;