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

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

    location = /healthz {
        default_type text/plain;
        return 200 "ok\n";
    }

    # 前端统一请求 /api，保持原始路径转发给 Gateway。
    location /api/ {
        client_max_body_size 12m;
        proxy_pass ${API_UPSTREAM};
        proxy_http_version 1.1;
        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;
    }

    # 海外业务使用独立 Gateway；浏览器前缀只在此处改写一次为 /api。
    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 $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;
    }

    # 支持 Vue Router history 路由直接刷新。
    location / {
        try_files $uri $uri/ /index.html;
    }
}