title: How to upload image with base64 format?
body: <p>I am trying to do image upload with base64 format using httpclient, anybody has experienced on this?</p>
  
  <pre><code>            using (var client = new HttpClient())
              {
                  client.DefaultRequestHeaders.Accept.Clear();
                  client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
  
                  var detect = new Dictionary&lt;string, string&gt;
                  {
                     { "api_key", API_KEY },
                     { "api_secret", API_SECRET },
                     { "urls", _base64 }
                  };
  
                  var content = new FormUrlEncodedContent(detect);
                  var response = await client.PostAsync(DETECT_URL, content);
  
                  HttpStatusCode _statusCode = response.StatusCode;
  
              }
  </code></pre>
  
  <p>the above codes returns BadRequest, please help</p>
  
  <p>many thanks in advance</p>
  
  <p>Don</p>