How to check if given url is existed

Thanks very much for your help.
I have found this piece of code, which checks the give website url is available.

bool CInternet::WebsiteAvailable(char* sURL)
{
// Declare variables
bool bAvailable = false;
CInternetSession * pNetSession = NULL;
CHttpConnection * pConnection = NULL;
CHttpFile * pFile = NULL;
CString sServer, sObject;
INTERNET_PORT nPort;
DWORD dwServiceType, dwStatusCode;

// Try to get a filepointer
try
{
// Parse URL to get all data
if (!AfxParseURL(sURL, dwServiceType, sServer, sObject, nPort))
{
// Unable to parse website address
return false;
}

// Get internet session
pNetSession = new CInternetSession();

// Get connection
pConnection = pNetSession->GetHttpConnection(sServer, nPort);

// Get the file
pFile = pConnection->OpenRequest(_T("GET"), sObject, _T(""), 1, NULL, NULL,
INTERNET_FLAG_KEEP_CONNECTION | INTERNET_FLAG_RELOAD);

// Check if file is available
if (pFile != NULL)
{
// Try to send an empty request
pFile->SendRequest();

// Check the status code
pFile->QueryInfoStatusCode(dwStatusCode);
if (dwStatusCode != HTTP_STATUS_NOT_FOUND)
{
// Yes, file is reachable
bAvailable = true;
}
};

// Close connection
pFile->Close();
pNetSession->Close();
}
catch (CException * pEx)
{
// Delete exception
pEx->Delete();

// Be sure result is false
bAvailable = false;
}

// Return result
return bAvailable;
}

But it doesn't work for https url.
How should I do?