server {
  listen 3000;
  server_name _;
  root /usr/share/nginx/html;
  index index.html;

  # 入口脚本写入集群 DNS；变量 proxy_pass 必须配合 resolver
  resolver __RESOLVER__ valid=10s ipv6=off;

  location = /api/health {
    default_type text/plain;
    add_header Content-Type text/plain;
    return 200 "ok";
  }

  # 反代到 A 站（默认公网域名；也可改成集群内 Service）
  location /embed/ {
    set $a_upstream __A_UPSTREAM__;
    proxy_pass $a_upstream$request_uri;
    proxy_http_version 1.1;
    proxy_ssl_server_name on;
    proxy_set_header Host __A_HOST__;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;
  }

  location /images/ {
    set $a_upstream __A_UPSTREAM__;
    proxy_pass $a_upstream$request_uri;
    proxy_http_version 1.1;
    proxy_ssl_server_name on;
    proxy_set_header Host __A_HOST__;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;
  }

  location = /api/contact {
    set $a_upstream __A_UPSTREAM__;
    proxy_pass $a_upstream$request_uri;
    proxy_http_version 1.1;
    proxy_ssl_server_name on;
    proxy_set_header Host __A_HOST__;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;
  }

  location / {
    try_files $uri $uri/ /index.html;
  }
}