Check Http & Https Url Exists in c sharp

Question

I am Currently Working on a project which i am facing a problem to check the HTTPS URL is correct or not. Now i have done validation for HTTP in c# now i want validation for HTTPS

My code for HTTP Validation.

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Proxy = WebProxy.GetDefaultProxy();
request.Proxy.Credentials = CredentialCache.DefaultCredentials;

// execute the request
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Response.Clear();
Response.Write(response.StatusDescription);
Response.End();

Anil

Answer 1

From MSDN

The Create method returns a descendant of the WebRequest class determined at run time as the closest registered match for requestUri.

For example, when a URI beginning with http:// or https:// is passed in requestUri, an HttpWebRequest is returned by Create .

If a URI beginning with ftp:// is passed instead, the Create method will return a FileWebRequest instance. If a URI beginning with file:// is passed instead, the Create method will return a FileWebRequest instance.

The pre-registered reserve types already registered include the following:

http://

https://

ftp://

file://

The .NET Framework includes support for the http://, https://, ftp://, and file:// URI schemes. Custom WebRequest descendants to handle other requests are registered with the RegisterPrefix method.

Full reference here

To resolve the error: "The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel" write this code before the request and the certificate should validate.

 ServicePointManager.ServerCertificateValidationCallback +=
    delegate(
        object sender,
        X509Certificate certificate,
        X509Chain chain,
        SslPolicyErrors sslPolicyErrors)
        {
             return true;
        };

Answer 2

Ref : http://www.heatonresearch.com/articles/166/page2.html

try
{
    Uri uri = new Uri("https://www.httprecipes.com/1/5/https.php");

    WebRequest http = HttpWebRequest.Create(url);
    HttpWebResponse response = (HttpWebResponse)http.GetResponse();
    Stream stream = response.GetResponseStream();
}
    catch(UriFormatException e)
{
    Console.WriteLine("Invalid URL");
}
catch(IOException e)
{
    Console.WriteLine("Could not connect to URL");
}