server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # 容器内健康检查、日志都走 stdout
    access_log /dev/stdout;
    error_log  /dev/stderr warn;

    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css application/javascript application/json image/svg+xml;

    # 带 hash 的构建产物可以长缓存
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # 入口 HTML 不缓存，保证发版后立刻生效
    location = /index.html {
        add_header Cache-Control "no-cache, must-revalidate";
    }

    # SPA 路由回退
    location / {
        try_files $uri $uri/ /index.html;
    }
}