对接百度人脸分割接口，报出216201错误

将base64中的空格去掉

代码：

 public ActionResult body_seg(string base64)
        {
            string token = getAccessToken();
            logo: string host = "https://aip.baidubce.com/rest/2.0/image-classify/v1/body_seg?access_token=" + token;
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
            request.Method = "post";
            request.KeepAlive = true;
            // 图片的base64编码
            //string base64 = getFileBase64("[本地图片文件]");
            String str = "image=" + HttpUtility.UrlEncode(base64.Replace(" ", "+").Replace("=", "A"));
           // String str = "image=" + HttpUtility.UrlEncode(base64);
            byte[] buffer = encoding.GetBytes(str);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            //"log_id": 2451426617428943180,
            string result = reader.ReadToEnd();
            var obj = result.ToJson();
            result = obj.ToString();
            System.Diagnostics.Debug.WriteLine(result);
            var JResult = result.ToJObject();

            //Console.WriteLine("人像分割:");
            //Console.WriteLine(result);
            string str_result = "";
            try
            {
                str_result = JResult["foreground"].ToString();
                return Content(new ResParameter { code = ResponseCode.success, info = "1", data = str_result }.ToJson());
            }
            catch (Exception ex)
            {
                str_result = JResult["error_code"].ToString();
                return Content(new ResParameter { code = ResponseCode.fail, info = "3", data = str_result }.ToJson());
            }
            //return result;
        }