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

    # gzip 压缩
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    gzip_min_length 1024;

    # 静态资源缓存
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot|otf)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # API 反向代理（动态配置，启动时由 entrypoint.sh 替换占位符）
    # BEGIN_API_PROXY
    location @@API_LOCATION@@ {
        proxy_pass @@API_TARGET@@;
        proxy_set_header Host $proxy_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;
    }
    # END_API_PROXY

    # SPA 路由：所有请求回退到 index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # 安全响应头
    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;
}