If you are not sure if the website you want to visit is safe, you can check it out here. Enter the address (url) of the website and see the invisible elements, such as a header or meta data.
site address:img.grouponcdn.com/sls/2Vu58rtAVhL15DgsLPnhBAvUdzGo/gcx-pet-supplies-emea-335x300/v1/q7...
favicon.ico:
URL does not point to a web page (html/xhtml) or read error or page not found. (5002)

Header

HTTP/1.1 200 OK
Server nginx/1.12.2
Content-Type image/jpeg
Content-Length 15732
Last-Modified Wed, 22 Aug 2018 21:03:07 GMT
ETag 3b77f764706a7013dd806d44cd051990
Cache-Control public, max-age=2592000
Expires Sat, 22 May 2021 13:37:06 GMT
Date Thu, 22 Apr 2021 13:37:06 GMT
Connection keep-alive
Access-Control-Allow-Origin *

Load Info

page size15732
load time (s)0.66741
redirect count0
speed download23571
server IP104.80.20.162


* all occurrences of the string "http://" have been changed to "htt???/"