test .

Src/Dlhis.Basic/Organization/Controllers/GainfoFacesController.cs

@@ -49,18 +49,18 @@ public class GainfoFacesController : ControllerBase
         var secret = "MLl7Dv7p5Pgc9XYI3r4O";
 
         var headers = InitRequest(url, body, key, secret);
-        foreach (var item in headers)
+        foreach (var item in headers.Where(x => x.Key != "Content-Type"))
         {
             client.DefaultRequestHeaders.Add(item.Key, item.Value);
         }
 
-        var r = await client.PostAsync(url, new StringContent(body));
+        var r = await client.PostAsync(url, new StringContent(body, Encoding.UTF8, "application/json"));
         return await r.Content.ReadAsStringAsync();
     }
 
     private static Dictionary<string, string> InitRequest(string url, string body, string key, string secret)
     {
-        Dictionary<string, string> header = new Dictionary<string, string>();
+        var header = new Dictionary<string, string>();
 
         // Accept                
         header.Add("Accept", "application/json");