[Nginx] 升级nginx支持HTTP/2服务端推送的方法

• 升级NGINX
  
• 修改NGINX配置
  
• 修改wordpress主题
  

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1

yum update

systemctl restart nginx

$ curl -I 127.0.0.1
HTTP/1.1 301 Moved Permanently
Server: nginx/1.14.0

location ~ \.php$ {
  # ...省略其他配置
  http2_push_preload on; # 加上这行
}

link: </index.js>; as=script; rel=preload

link: </index.js>; as=script; rel=preload, </index.css>; as=style; rel=preload

function add_http2_push_header() {
  $preload_resource_array = array(
  '</index.js>; as=script; rel=preload',
  '</index.css>; as=style; rel=preload'
  );
  $preload_link_value = join( ', ', $preload_resource_array );
 
  header( 'link: '.$preload_link_value ); 
}
add_action( 'send_headers', 'add_http2_push_header' );