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.o571.com/fc/ad/20161022191506944.gi...
site title:
Url ContentGraphics Interchange Format
MIME Type / Internet Media Typeimage/gif
MIME Type image
File Extension.gif
More Details (link to:)Wikipedia: Graphics Interchange Format
Powered by: Very Tiny URL Shortener at https://vturl.net VeryTinyURL

Header

HTTP/1.1 200 OK
Cache-Control max-age=2592000
Content-Type image/gif
Last-Modified Sat, 22 Oct 2016 11:15:06 GMT
Accept-Ranges bytes
ETag 9023628b552cd21:0
Server Microsoft-IIS/7.5
X-Powered-By ASP.NET
Date Sun, 20 May 2018 14:05:25 GMT
Content-Length 42793

Load Info

page size42793
load time (s)5.825824
redirect count0
speed download0
server IP118.31.112.121


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