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:yandex.com/showcaptcha?cc=1&retpath=https%3A/yandex.com/safety%3Furl%3Dip-rauchmelder.de_eca41ff49ad2df29a1b55eeed5c26cc0&t=2/1617890312/e00fa88f4b6680f72dbe6a9e26810f29&s=b97e4508f36eeefd18ba76ee23f5827...
URL does not point to a web page (html/xhtml) or read error or page not found. (403)

Header

HTTP/1.1 403 Forbidden
Content-Length 0
NEL report_to : network-errors , max_age : 86400, success_fraction : 0.001, failure_fraction : 0.1
Report-To group : network-errors , max_age : 86400, endpoints : [ url : htt????/dr.yandex.net/nel ]
X-Content-Type-Options nosniff

Load Info

load time (s)0.067491
redirect count0
speed download0
server IP2a02:6b8:a::a


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