php - 内容类型文本/降价将不适用

Question

我将页面内容类型设置为Content-Type: text/markdown，输出字符串应该是粗体，但它显示的是原始字符串：**bold**

这些是 HTTP 标头：

HTTP/1.1 200 OK
Cache-Control: no-cache
Connection: Keep-Alive
Content-Type: text/markdown; charset=UTF-8
Date: Tue, 12 Nov 2013 17:30:35 GMT
Keep-Alive: timeout=5, max=100
Server: Apache/2.4.3 (Win32) OpenSSL/1.0.1c PHP/5.4.7
Set-Cookie: laravel_session=qf3bsgt8l2ao97vh9650mq9e30; expires=Tue, 12-Nov-2013 19:30:35 GMT; path=/; httponly
Transfer-Encoding: chunked
X-Powered-By: PHP/5.4.7

我也使用了 text/x-markdown 虽然它已被弃用。