使用postman调用是正常的，但是在代码里调用就报错。

使用语言c#

                  string? access_token = _jObject["access_token"]?.ToString();
            var parameters = new ParamObj
            {
                scene = "23",
                page = "pages/end/end",
                check_path = "false"
            };
            var urlOfCode = $"/wxa/getwxacodeunlimit?access_token={access_token}";
            var requestContent = JsonContent.Create(parameters);
            httpReponseMessage = await client.PostAsync(urlOfCode, requestContent);
            var result = await httpReponseMessage.Content.ReadAsByteArrayAsync();