server {
    listen 80;
    listen [::]:80;
    server_name _;

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

    # Docker 容器运行正常的检查地址，供 Jenkins 使用。
    location = /healthz {
        default_type text/plain;
        return 200 "ok\n";
    }

    location = /runtime-config.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header Pragma "no-cache" always;
        add_header Expires "0" always;
        try_files $uri =404;
    }

    # 前端代码中的 API 前缀为 /api；保持原始路径转给 Gateway。
    location /api/ {
        client_max_body_size 12m;
        proxy_pass ${API_UPSTREAM};
        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;
    }

    # 海外业务使用独立 Gateway；将浏览器前缀改写为 Gateway 的 /api 前缀。
    location /overseas-api/ {
        client_max_body_size 12m;
        rewrite ^/overseas-api/(.*)$ /api/$1 break;
        proxy_pass ${OVERSEAS_API_UPSTREAM};
        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;
    }

    # HTML must be revalidated on every visit so a new deployment cannot keep
    # referencing hashed chunks that were removed with the previous image.
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header Pragma "no-cache" always;
        add_header Expires "0" always;
    }

    # Vite assets are content-hashed and safe to cache permanently. Missing
    # chunks must remain a real 404 instead of falling back to index.html.
    location /assets/ {
        try_files $uri =404;
        add_header Cache-Control "public, max-age=31536000, immutable" always;
    }

    # Vue Router 的 history 路由刷新时仍返回 index.html。
    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache" always;
    }
}