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I need to check if a given URL (which is not necessarily prefixed with http or https) is HTTP or HTTPs.
Is this possible in C#?
If the user gives just www.dotnetperls.com without any prefix, I must be able to identify that it is an HTTP one. Tried the following,

 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("www.dotnetpearls.com");         
 string u = request.RequestUri.Scheme;

But this gives an Invalid URL error. It expects the protocol to be specified.

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  • 4
    your question does not make sense. if an url does not have https it is http Commented Dec 19, 2013 at 10:27
  • 1
    But in my case, the user may enter any url say, www.wikipedia.org, which is actually an HTTPS. So in this case I need to find if its is an HTTPS or HTTP and display a warning message accordingly only if HTTP. Commented Dec 19, 2013 at 10:46
  • 3
    you have to use webclient and make a request to http and check if it is http or https with Request.IsSecureConnection Commented Dec 19, 2013 at 10:58
  • Can you provide an example URL that doesn't contain the protocol? Commented Dec 19, 2013 at 13:24
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    web requests are BY DEFAULT http. The client can NOT simply ignore that and start firing off https requests. Not all sites are https-enabled. The initial request, if you don't explicitly specify https in the url, HAS to be http, and then the remote server can issue a redirect and point you at the https version instead. But regardless, your initial protocol-less-url hit HAS to be http. HTTP 2.0 will apparently change to an ssl-first-by-default mode, but that's at some vague point in the future, not "today". Commented Dec 19, 2013 at 14:13

6 Answers 6

Reset to default
13

try something like this:

public static bool IsHttps()
{
    return HttpContext.Current.Request.IsSecureConnection;
}

Or if you working with you can check if Request.RequestUri.Scheme is Uri.UriSchemeHttps.

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1 Comment

but I all I have is just a url without http/https prefix and not a http request itself.
11 
var uri = new Uri("https://sss.com");
var requestType= uri.Scheme;

Here the requestType will will give you whether the request is of type http or https

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2 Comments

My url does not contain a http/https prefix. So cant use this, since it will show "URI not in correct format error".
@wickjon You can check if it's absolute first, then check if it's https bool isSecure = uri.IsAbsoluteUri && uri.Scheme.Equals("https")
2 
if (url.StartsWith("https://", StringComparison.OrdinalIgnoreCase))
{
}
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1

I've been looking for a solution for the same as well and unfortunately I couldn't find any.

And also some websites doesn't support www as well.

So I'm sending 4 requests to find out if the website supports https and finding the one that supports.

I know this is not a good solution but it works at least. If the first one works, I'm not calling the rest of them...

  1. WebRequest.Create("https://dotnetpearls.com");
  2. WebRequest.Create("https://www.dotnetpearls.com");
  3. WebRequest.Create("http://dotnetpearls.com");
  4. WebRequest.Create("http://www.dotnetpearls.com");
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0

You can use HttpRequest.IsSecureConnection

HttpContext.Current.Request.IsSecureConnection

OR, where request object is available.

Request.IsSecureConnection
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1 Comment

but I all I have is just a url without http/https prefix and not a http request itself.
0

For ASP.net core the property Request.Scheme is available that works for me:

var uri = String.Format("{0}://{1}",Request.Scheme,Request.Host.Value);
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