C＃|无效的URI：无法确定URI的格式

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我不断收到错误消息：“无效的URI：无法确定URI的格式。” 这是我的代码：

public static string Get()
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(@"27.**.***.14"); // the asterisks are just to protect my IP 

            request.MaximumAutomaticRedirections = 4;
            request.MaximumResponseHeadersLength = 4;
            request.Credentials = CredentialCache.DefaultCredentials;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream receiveStream = response.GetResponseStream();
            StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
            string result = readStream.ReadToEnd();
            response.Close();
            readStream.Close();
            return result;
        }

IP也指向我在树莓派PI上运行的HTTP服务器。 是的，当我对其进行测试时，服务器正在运行。