为什么资源无法通过http2加载

Question

我已经使用 apache 启用了 http2，

<IfModule mod_ssl.c>
<VirtualHost _default_:443>
    ServerAdmin contact@***.com
    ServerName dev.***.com
    ServerAlias dev.***.com

    Protocols h2 http/1.1
    H2Push on
    H2PushPriority * after
    H2PushPriority text/css before
    H2PushPriority image/jpg after 32
    H2PushPriority image/jpeg after 32
    H2PushPriority image/png after 32
    H2PushPriority application/javascript interleaved


    ................

但我不明白为什么 javascript 和 css 文件要用 HTTP/1 加载不是使用 HTTP/2

有些图像是用HTTP/2加载的！！