如何利用map实现Nginx允许多个域名跨域

server {
  listen    11111;
  server_name localhost;

  location ~ /xxx/xx {
    if ($request_method = 'OPTIONS') {
      return 204;
    }
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
    add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
    proxy_pass http://1.2.3.4:5678;
  }
}

map $http_origin $allow_origin {
  default "";
  "~^(https" $1;
  "~^(https" $1;
  "~^(https" $1;
  "~^(https" $1;
}

server {
  listen    11111;
  server_name localhost;

  location ~ /xxx/xx {
    if ($request_method = 'OPTIONS') {
      return 204;
    }
    add_header Access-Control-Allow-Origin $allow_origin;
    add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS';
    add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
    add_header Access-Control-Allow-Credentials 'true';
    proxy_pass http://1.2.3.4:5678;
  }
}