【HttpClient】请求微信内容安全的图片检测接口

前言

使用HttpClient去请求微信内容安全的图片检测接口，验证图片的合法性

微信接口接口文档地址：

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/sec-check/security.imgSecCheck.html

请求代码

        /// <summary>
        /// 调用微信内容安全的图片信息检查
        /// </summary>
        /// <param name="access_token">微信小程序请求接口access_token</param>
        /// <param name="file">文件信息</param>
        /// <returns></returns>
        public async Task<string> ImgSecCheck(string access_token, Microsoft.AspNetCore.Http.IFormFile file)
        {
            string url = $"https://api.weixin.qq.com/wxa/img_sec_check?access_token={access_token}";

            HttpResponseMessage response = null;

            using (Stream fs = file.OpenReadStream())
            {
                //原文件生成的字节数组
                byte[] fileBytes = new byte[fs.Length];
                fs.Read(fileBytes, 0, fileBytes.Length);

                var byteFileContent = new ByteArrayContent(fileBytes);
                byteFileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");//指定Content-Type
                byteFileContent.Headers.ContentDisposition = ContentDispositionHeaderValue.Parse($"form-data; name="fileName"; filename="{file.FileName}"");

                response = await _client.PostAsync(url, byteFileContent);
            }

            string r = string.Empty;

            if (response.IsSuccessStatusCode)
                r = await response.Content.ReadAsStringAsync();

            return r;
        }

错误代码

下面的方法在调用其他系统的FromForm接口文件的接口时可以使用

但是在请求微信内容安全的图片接口时就一直提示 {"errcode":47001,"errmsg":"data format error"} 错误

使用MultipartFormDataContent去传值，修改了Content-Type、Content-Disposition等信息，还是不行，最终采用了上面的方式

        /// <summary>
        /// 上传文件
        /// </summary>
        /// <param name="access_token"></param>
        /// <param name="file"></param>
        /// <returns></returns>
        public async Task<MessageModel<string>> UploadFile(string access_token, Microsoft.AspNetCore.Http.IFormFile file)
        {
            string url = $"https://api.weixin.qq.com/wxa/img_sec_check?access_token={access_token}";

            MessageModel<string> result = new MessageModel<string>(false, "响应失败");

            using (var content = new MultipartFormDataContent())
            {
                using (Stream fs = file.OpenReadStream())
                {
                    //原文件生成的字节数组
                    byte[] fileBytes = new byte[fs.Length];
                    fs.Read(fileBytes, 0, fileBytes.Length);

                    content.Add(new ByteArrayContent(fileBytes), "fileName", file.FileName);

                    HttpResponseMessage response = await _client.PostAsync(url, content);

                    string r = string.Empty;

                    if (response.IsSuccessStatusCode)
                        r = await response.Content.ReadAsStringAsync();

                    result.Code = 200;
                    result.Msg = "上传成功";
                    result.Data = r;
                }
            }

            return result;
        }