server_push_with_ngx_mruby.conf

    server {
        listen       80 http2; #h2を有効化
        server_name  localhost;

        # http2_push_preload on; #preload方式のプッシュを有効化
        mruby_access_handler_code '
        http2 = Nginx::HTTP2.new
        if Nginx::Var.new.host == "http2.example.com"
          http2.enable_server_push_preload
        else
          http2.disable_server_push_preload
        end
        ';
        location / {
            root   html;
            add_header "Link" "</test.js>;rel=preload"; #Linkヘッダを付ける
            index  index.html index.htm;
        }
    }