=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 301 Moved Permanently
Date: Sun, 11 Feb 2018 14:45:47 GMT
Server: Varnish
X-Varnish: 12204085
Location: https://www.essilor.fr/
Content-Length: 0
Connection: close

HTTP/1.1 200 OK
Server: nginx
Date: Sun, 11 Feb 2018 14:45:47 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Cache-Control: public, s-maxage=86400, max-age=0
X-Location-Id: 16348 34143 34159 39484 49358 58896 64547
Vary: Cookie,Accept-Encoding,Authorization
Expires: Sun, 11 Feb 2018 12:59:34 GMT
X-UA-Compatible: IE=Edge,chrome=1
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Access-Control-Allow-Headers: origin, x-requested-with, content-type
Access-Control-Allow-Methods: PUT, GET, POST, DELETE, OPTIONS
Age: 6372
X-Cache: HIT
X-Cache-Hits: 111
X-Powered-By: Oxalide
X-Server: essilor.web.hosting-01
X-Director: vdir
X-Backend-Status: 200
Strict-Transport-Security: max-age=31536000; includeSubDomains

Request headers
================
HEAD / HTTP/1.1
Host: www.essilor.fr
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Accept: */*
Referer: http://51.15.134.16
Connection: close


Link is valid.