nginx 设置多个站跨域

set $cors_origin "";
        if ($http_origin ~* "^https://www.abc.com$") {
	set $cors_origin $http_origin;
}

if ($http_origin ~* "^https://abc.com$") {
	set $cors_origin $http_origin;
}

if ($http_origin ~* "^https://www.abc.cn$") {
	set $cors_origin $http_origin;
}

if ($http_origin ~* "^https://abc.cn$") {
	set $cors_origin $http_origin;
}

add_header Access-Control-Allow-Origin $cors_origin;

location / {
	if ($request_method = 'OPTIONS') {
       add_header Access-Control-Allow-Origin $cors_origin;
       add_header Access-Control-Allow-Methods GET,POST,PUT,DELETE,OPTIONS;
       return 404;
    }
}