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.youtube.com/vi/Etu-COz4y_s/0.jp...
Url ContentJPEG Image
MIME Type / Internet Media Typeimage/jpeg
MIME Type image
File Extension.jpeg, .jpg
More Details (link to:)RFC 1314
Powered by: Very Tiny URL Shortener at https://vturl.net VeryTinyURL

Header

HTTP/1.1 200 OK
Accept-Ranges bytes
Content-Type image/jpeg
Content-Length 12254
Timing-Allow-Origin htt????/imasdk.googleapis.com
Date Sat, 24 Feb 2018 04:18:10 GMT
Expires Sat, 24 Feb 2018 06:18:10 GMT
Cache-Control public, max-age=7200
ETag 1505910223
X-Content-Type-Options nosniff
Server sffe
X-XSS-Protection 1; mode=block

Load Info

page size12254
load time (s)0.051363
redirect count0
speed download0
server IP172.217.22.142


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