【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

/// <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;
}