How can nginx reverse proxy google app engine via SPDY?

[张沈鹏]

I write this and it success proxyed , but I want to let the proxy use SPDY
there is no how to use SPDY in revese proxy in the document

server{
    listen       443;
    server_name  42btc.com;

    ssl on;
    ssl_certificate /etc/ssl/certs/42btc.crt;
    ssl_certificate_key /etc/ssl/private/42btc.key;
    #enables SSLv3/TLSv1, but not SSLv2 which is weak and should no longer
be used.
    ssl_protocols SSLv3 TLSv1;
    #Disables all weak ciphers
    ssl_ciphers ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM;

    location / {

        proxy_set_header HOST xxx.appspot.com <http://42btc-com.appspot.com>
;

        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_pass  https://173.194.72.141;
    }
}

server {
    listen      80;
    server_name www.42btc.com 42btc.com *.42btc.com;
    charset utf-8;
    rewrite ^(.*)$ https://42btc.com$1 permanent;
}
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