One example how to create URI with HTTP protocol. If we have like "www.milosev.com" and link is "2015-01-23-20-08-55/gallery", then safest way is to do it like:
Uri domain = new UriBuilder("milosev.com").Uri;

if (Uri.TryCreate(domain, "2015-01-23-20-08-55/gallery", out Uri myUri))
{
	Console.WriteLine(myUri.AbsoluteUri);
}