我有一个函数,当你输入网站的url时,它会返回该网站的服务器:
private string GetWebServer()
{
string server = string.Empty;
//get URL
string url = txtURL.Text.Trim().ToLower();
if (!url.StartsWith("http://") && !url.StartsWith("https://"))
url = "http://" + url;
HttpWebRequest request = null;
HttpWebResponse response = null;
try
{
request = WebRequest.Create(url) as HttpWebRequest;
response = request.GetResponse() as HttpWebResponse;
server = response.Headers["Server"];
}
catch (WebException wex)
{
server = "Unknown";
}
finally
{
if (response != null)
{
response.Close();
}
}
return server;
}
我希望能够通过IP地址获取网站的服务器,而不是通过网站的URL。但是,如果我输入IP地址,在调用WebRequest.Create(url)时会出现错误:"无效的URI:无法确定URI的格式。" 有人知道我该如何修改才能实现我的目标吗?