怎么查找 Retrofit 请求失败的原因呢

请求失败，又不知道什么原因，该怎么解决

private void getData() {
    String baseUrl1 = "http://demo.wp-api.org/";
    Retrofit retrofit1 = new Retrofit.Builder()
            .baseUrl(baseUrl1)
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    ArticleaaApi articleaaApi=retrofit1.create(ArticleaaApi.class);

    Call<ArticleBean> articleBeanCall = articleaaApi.getArticle();
    articleBeanCall.enqueue(new Callback<ArticleBean>() {
        @Override
        public void onResponse(Call<ArticleBean> call, Response<ArticleBean> response) {
            System.out.println("S");
        }
        @Override
        public void onFailure(Call<ArticleBean> call, Throwable t) {
            System.out.println("F");
        }
    });
}

API ：

public interface ArticleaaApi {
    @GET("wp-json/wp/v2/posts")
    Call<ArticleBean> getArticle();
}