This is not a typical website you can visit or use. rr4.sn-8xgp1vo-2iaee.googlevideo.com is a subdomain of googlevideo.com, which normally powers video delivery for Google services. But this specific endpoint is broken: it has an invalid SSL certificate for its own hostname and returns a 404 error. That means any attempt to reach it results in a failed connection or a blank error page.
For a legitimate CDN endpoint, a valid SSL certificate matching the exact hostname is essential. This one doesn't have it, so you can't trust that you're actually talking to Google's servers. There's no content, no contact information, and no sign of who operates this exact address beyond the parent domain.
If you encounter rr4.sn-8xgp1vo-2iaee.googlevideo.com in a video link, configuration file, or network log, treat it with extreme caution. It is not a working service and any data sent to or received from it could be compromised. The safest move is to avoid it entirely.