#Define URI
$ReqURI = "https://blablabla.bla"

#Get list of all supported versions of TLS
$TLSversions = [System.Security.Authentication.SslProtocols] | gm -static -MemberType Property | Where {$_.name -Match "tls*"} | %{$_.Name}

#Request URI
[Net.ServicePointManager]::SecurityProtocol= $TLSversions
$r = [System.Net.WebRequest]::Create($ReqURI)
$resp = $r.GetResponse()
$reqstream = $resp.GetResponseStream()
$sr = new-object System.IO.StreamReader $reqstream
$result = $sr.ReadToEnd()
write-host $result