c# - ASP.NET HTTP to HTTPS redirect with www prefix -

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i using simple code redirect http https on billing landing page:

if (!request.issecureconnection) {     // send user ssl      string servername =httputility.urlencode(request.servervariables["server_name"]);             string filepath = request.filepath;     response.redirect("https://" + servername + filepath); }

i need check , add www url if not in url. need add code accomplish this?

like this:

if (!servername.startswith("www."))     servername = "www." + servername;

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