=== HTTP code : 200 ===

Response headers
================
HTTP/2 200 
expires: Tue, 27 Apr 1971 19:44:06 EST
cache-control: no-cache
content-type: text/html; charset=utf-8
x-frame-options: SAMEORIGIN
strict-transport-security: max-age=31536000
x-content-type-options: nosniff
p3p: CP=&quot;This is not a P3P policy! See http://support.google.com/accounts/answer/151657?hl=en for more info.&quot;
date: Tue, 16 Apr 2019 07:12:59 GMT
server: YouTube Frontend Proxy
x-xss-protection: 0
set-cookie: VISITOR_INFO1_LIVE=c7e-_wLfMm8; path=/; domain=.youtube.com; expires=Sun, 13-Oct-2019 07:12:58 GMT; httponly
set-cookie: GPS=1; path=/; domain=.youtube.com; expires=Tue, 16-Apr-2019 07:42:58 GMT
set-cookie: YSC=ZSBIh79_DA8; path=/; domain=.youtube.com; httponly
alt-svc: quic=&quot;:443&quot;; ma=2592000; v=&quot;46,44,43,39&quot;
accept-ranges: none
vary: Accept-Encoding

Request headers
================
HEAD /watch?v=SEAnSj5NNO4 HTTP/2
Host: www.youtube.com
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Accept: */*
Referer: https://itxdesign.com
Connection: close


Link is valid.