tumblr 从其网页中提供了一个 X-Tumblr-Content-Rating 标题。那是如何精确定义的?它是由 Tumblr 手工标记的吗?它的用户是否应用它?
$ curl -I puppies.tumblr.com 2>&1 | grep Content-Rating
$ curl -I evawomans.tumblr.com 2>&1 | grep Content-Rating
X-Tumblr-Content-Rating: nsfw
$ curl -I porn.tumblr.com 2>&1 | grep Content-Rating
X-Tumblr-Content-Rating: adult