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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;
       }