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:cdn4.slideserve.com/7597000/nelson-mandela-t.jp...
site title:
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
Server Apache/2.2.29 (Unix) mod_ssl/2.2.29 OpenSSL/1.0.1e-fips mod_bwlimited/1.4
Last-Modified Sat, 03 Jun 2017 09:54:16 GMT
ETag 6da387b-1a6d-5510b40ba6200
Accept-Ranges bytes
Content-Length 6765
Content-Type image/jpeg
Cache-Control max-age=31536000
Expires Tue, 16 Jun 2020 21:05:44 GMT
Date Mon, 17 Jun 2019 21:05:44 GMT
Connection keep-alive

Load Info

page size6765
load time (s)0.453071
redirect count0
speed download0
server IP2.17.40.75


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