Asp.net Web API从图片发送字节数组给出404

我需要帮助我的WebAPI。我在服务器中有以下内容：

 [System.Web.Http.HttpGet]
        public HttpResponseMessage Recognize(byte[] img)
        { 

        }

我的客户要求：

  using (var client = new HttpClient())
            {

                client.BaseAddress = new Uri("http://localhost/MP.Business.Implementation.FaceAPI/");
                using (var request = new HttpRequestMessage(HttpMethod.Get, client.BaseAddress))
                {
                    var imageStream = new ByteArrayContent(pic);
                    var multi = new MultipartContent();
                    multi.Add(imageStream);

                    //   var response = client.
                    HttpResponseMessage response = client.GetAsync("api/Recognition/Recognize/"+ multi).Result;

断点未命中，我得到404。但是，如果我发送此请求：

 HttpResponseMessage response = client.GetAsync("api/Recognition/Recognize/").Result;

---

断点被命中，很明显我在里面得到了错误，因为字节[]为空（但至少命中了）。我做错了什么？

99%确定这应该是一篇文章而不是一篇文章，因为你发布的数据应该是client.PostAsync