Send a form to a HTTP server in rails

Hi, i'm trying to use UnityWebRequest to send a form to a Ruby on Rails server, but the error, HTTP/1.1 404 Not Found, keep comming.

My code is here:

public void Update_GI_Score() { StartCoroutine(Update_GI_Score_FORM()); }

 IEnumerator Update_GI_Score_FORM()
 {
     WWWForm form = new WWWForm();
     form.AddField("myField", "myData");

     Game game = Singleton.GameInstance;
     foreach (Score s in game.scores)
     {
         form.AddField("name", s.Name);
         form.AddField("value", s.rate.ToString());
     }

     var url = RequestController.Instance.baseURL + "atualiza_score";
     UnityWebRequest www = UnityWebRequest.Post(url, form);
     yield return www.SendWebRequest();

     if (www.isNetworkError || www.isHttpError)
     {
         Debug.Log(www.error);
     }
     else
     {
         Debug.Log("Form upload complete!");
     }
 }

In the rails routes i got:

post 'atualiza_score', controller: 'integracao_games', action: :atualiza_score

so how can i get the form correctly, i need to save the field into a database

thanks.