=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Connection: close
Content-Length: 35
Location: https://flutter.dev/
Content-Type: text/plain; charset=utf-8
Accept-Ranges: bytes
Date: Wed, 24 Nov 2021 03:19:47 GMT
X-Served-By: cache-tyo11944-TYO
X-Cache: MISS
X-Cache-Hits: 0
X-Timer: S1637723987.937162,VS0,VE174
Vary: x-fh-requested-host, accept-encoding

HTTP/1.1 200 OK
Connection: close
Content-Length: 48952
Cache-Control: max-age=3600
Content-Type: text/html; charset=utf-8
Etag: &quot;683d5b7581ba8ef94f701a995570562ecc26b89cf50c24b02ad5cd37dae72721&quot;
Last-Modified: Tue, 23 Nov 2021 23:58:45 GMT
Strict-Transport-Security: max-age=31556926
Accept-Ranges: bytes
Date: Wed, 24 Nov 2021 03:19:47 GMT
X-Served-By: cache-tyo11937-TYO
X-Cache: HIT
X-Cache-Hits: 1
X-Timer: S1637723987.349797,VS0,VE1
Vary: x-fh-requested-host, accept-encoding

Request headers
================
HEAD / HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: flutter.dev
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.