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:media-cdn.tripadvisor.com/media/photo-s/04/9d/1b/ce/the-pillows-were-stained.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
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Header

HTTP/1.1 200 OK
Accept-Ranges bytes
Access-Control-Allow-Origin *
Cache-Control max-age=2592000
Content-Type image/jpeg
Date Sat, 23 Jun 2018 15:44:50 GMT
Etag 521bee176495e7952b9a60b2172fc760
Last-Modified Fri, 21 Nov 2014 01:17:16 GMT
Server ECAcc (dcc/42B3)
Timing-Allow-Origin htt????/www.tripadvisor.com
X-Cache HIT
X-Media-CDN 682378823
X-Media-CDN-Cache PASS
X-Media-CDN-Cache-Hits 0
Content-Length 23048

Load Info

page size23048
load time (s)0.013231
redirect count0
speed download0
server IP68.232.34.11


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