fix 使用域名请求

Src/Dlhis.User/Identity/Controllers/OAuth2Controller.cs

@@ -28,7 +28,7 @@ public class OAuth2Controller : ControllerBase
     {
         var authority = _identityServerOption.Value.Authority;
 
-        var httpClient = _httpClientFactory.CreateClient("oauth2");
+        var httpClient = _httpClientFactory.CreateClient();
 
         var content = new StringContent($"grant_type=client_credentials&client_id={request.ClientId}&client_secret={request.ClientSecret}&scope={request.Scope}", Encoding.UTF8, "application/x-www-form-urlencoded");
         var response = await httpClient.PostAsync($"{authority}/connect/token", content);