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:fn.thainguyen.edu.vn/UploadImages/thcsnhatrang/2017_7/cong-van.jpg?w=15...
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
Cache-Control public
Content-Length 5228
Content-Type image/jpeg
Last-Modified Thu, 21 Sep 2017 08:30:36 GMT
Accept-Ranges bytes
ETag a02b44e6b332d31:0
Server Microsoft-IIS/10.0
X-Powered-By ASP.NET
Date Tue, 12 Dec 2017 00:32:41 GMT

Load Info

page size5228
load time (s)0.718119
redirect count0
speed download0
server IP42.112.27.39


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