nginx配置文件 http 强跳转 https，nginx配置文件在哪

nginx配置文件 http 强跳转 https，nginx配置文件在哪

server {
  listen       80;
  server_name  www.xxxx.com;

  if ($host = "www.xxxx.com"){
    return 301 https://www.xxxx.com$request_uri;
  }

}