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

    # Gzip压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;

    # 静态资源缓存
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header Vary "Accept-Encoding";
        try_files $uri =404;
    }

    # HTML文件不缓存
    location ~* \.(html|htm)$ {
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        try_files $uri $uri/ /index.html;
    }

    # SPA路由支持
    location / {
        try_files $uri $uri/ /index.html;
        
        # 安全头
        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;
    }

    # 健康检查
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }

    # 错误页面
    error_page 404 /index.html;
    error_page 500 502 503 504 /50x.html;
    
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}