MT#60227 handle Accept: application/json header

* if Accept: applicaton/json header is provided for API
  request - the response's Content-Type header is set to
  application/json. The return content in this case is preserved
  as HAL but it's helpful for the clients that only expect
  aplication/json response Content-Type

Change-Id: I8c60da4df7d639f45953d8ace699a59fefc88ddf

lib/NGCP/Panel/Role/Entities.pm

@@ -29,9 +29,17 @@ sub auto :Private {
 
 sub end :Private {
     my ($self, $c) = @_;
+
+    if (my $accept = $c->request->header('Accept')) {
+        if ($accept eq 'application/json') {
+            $c->response->content_type($accept);
+        }
+    }
+
     if ($self->get_config('log_response')) {
         $self->log_response($c);
     }
+
     return 1;
 }
 

lib/NGCP/Panel/Role/EntitiesItem.pm

@@ -34,9 +34,17 @@ sub auto :Private {
 
 sub end :Private {
     my ($self, $c) = @_;
+
+    if (my $accept = $c->request->header('Accept')) {
+        if ($accept eq 'application/json') {
+            $c->response->content_type($accept);
+        }
+    }
+
     if ($self->get_config('log_response')) {
         $self->log_response($c);
     }
+
     return 1;
 }