用另一个域名代理某个域名的 openresty 配置规则。

any_proxy.conf

server {
  listen  443 ssl;
  listen  80;

  server_name     pbs.a-domain.com  abs.a-domain.com  abs-0.a-domain.com;
  server_tokens   off;
  resolver        8.8.8.8 1.1.1.1 9.9.9.9 8.8.4.4;

  ssl_certificate ssl/a-domain.com.crt;
  ssl_certificate_key ssl/7a-domain.com.key;

  client_max_body_size  50M;
  access_log   /app/logs/openresty/a-domain.com.access.log;
  error_log    /app/logs/openresty/a-domain.com.error.log;

  proxy_cache                twimg;
  proxy_temp_path            /dev/shm/proxy-temp-path;
  proxy_max_temp_file_size   1024m;
  proxy_cache_use_stale      error timeout http_500 http_502 http_503 http_504;
  proxy_cache_lock                on;
  proxy_cache_background_update   on;

  location /~demo {
    set_by_lua_block $newhost {
      ngx.header.content_type = 'text/plain; charset=utf-8'
      return string.gsub(ngx.var.host, ".a-domain.com", ".b-domain.com")
    }
    echo "Host is: $newhost";
  }

  location / {
    set_by_lua_block $newhost {
      return string.gsub(ngx.var.host, ".a-domain.com", ".b-domain.com")
    }
    add_header    X-Cache-Status   $upstream_cache_status;
    proxy_pass    $scheme://$newhost$request_uri;
  }
}