C#

class ScanUrl
{
    /// <summary>
    /// Scan the URL and display headers.
    /// </summary>
    /// <param name="u">The URL to scan.</param>
    public StringBuilder Scan(String u)
    {
        StringBuilder sb = new StringBuilder();
        Uri url = new Uri(u);
        WebRequest http = WebRequest.Create(url);
        WebResponse response = http.GetResponse();

        int count = 0;
        String key, value;

        for (count = 0; count < response.Headers.Keys.Count; count++)
        {
            key = response.Headers.Keys[count];
            value = response.Headers[key];

            if (value != null)
            {
                if (key == null)
                    sb.Append(value + "\n");
                else
                    sb.Append(key + ": " + value + "\n");
            }
        }
        return sb;
    }
}