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:www.oreillynet.com/images/people/weblogs/tracey_pilone.jpg redirected to: archive.oreilly.com/images/people/weblogs/tracey_pilone.jp...
site title:
Url ContentHyperText Markup Language (HTML)
MIME Type / Internet Media Typetext/html
MIME Type text
File Extension.html
More Details (link to:)Wikipedia: HTML
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Header

HTTP/1.1 301 Moved Permanently
Date Tue, 17 Jul 2018 16:54:36 GMT
Server Apache
Location htt???/archive.oreilly.com/images/people/weblogs/tracey_pilone.jpg
Cache-Control max-age=2592000
Expires Thu, 16 Aug 2018 16:54:36 GMT
Content-Length 274
Content-Type text/html; charset=iso-8859-1

Load Info

load time (s)7.352375
redirect count1
speed download0
server IP95.100.252.17


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