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:umlonline.cn/attachments/2018/08/2_201808241311011vMFF.jp...
favicon.ico:
URL does not point to a web page (html/xhtml) or read error or page not found. (5002)

Header

HTTP/1.1 200 OK
Date Thu, 28 May 2020 12:32:32 GMT
Server Apache/2.2.3 (CentOS)
Last-Modified Fri, 24 Aug 2018 05:11:01 GMT
ETag 2a68ae8-25695-66cfe340
Accept-Ranges bytes
Content-Length 153237
Connection close
Content-Type image/jpeg

Load Info

page size153237
load time (s)4.226308
redirect count0
speed download36257
server IP112.121.178.133


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