nginx 反代谷歌学术，直接访问没问题，但是使用 cloudflare 加速就"重定向循环”

proxy_cache_path /home/wwwroot/cache levels=1:2 keys_zone=one:10m max_size=2g;
    proxy_cache_key "$host$request_uri";

upstream google 
    {
        server 74.125.224.71:80 max_fails=3;
        server 74.125.224.72:80 max_fails=3;
        server 74.125.224.73:80 max_fails=3;
        server 74.125.224.74:80 max_fails=3;
        server 74.125.224.75:80 max_fails=3;
        server 74.125.224.76:80 max_fails=3;
        server 74.125.224.77:80 max_fails=3;
        server 74.125.224.78:80 max_fails=3;
        server 74.125.224.79:80 max_fails=3;
        server 74.125.224.80:80 max_fails=3;
    }

server
    {
        listen 443 ssl;
        server_name scholar.XXX;

        ssl on;
        ssl_certificate /root/SSL/scholar.crt;
        ssl_certificate_key /root/SSL/scholar.key;



        location / {
            proxy_cache one;
            proxy_cache_valid 200 302 1h;
            proxy_cache_valid 404 1m;
            proxy_redirect https://scholar.google.com $1;
            proxy_set_header User-Agent $http_user_agent;
            proxy_set_header Accept-Language "en-US";
            proxy_set_header Cookie "PREF=ID=0c6c76f2987fb900:U=2be10fc61e76e72d:LR=lang_en|lang_zh-CN|lang_zh-TW:LD=en:NR=10:NW=1:CR=2:TM=1428108911:LM=1430658192:GM=1:SG=1:S=wu-EGyNG-Ne4CTZx:SAPISID=HSweuOjqjs24VODP/A-Q_tph2PzSDXePN4:GSP=ID=0123456789ABCDEF:IN=8b9a455bd1c58d67:CF=3:A=rT6pBw:CPTS=1428143481:LM=1429977292:S=yU2mQtMjmeWVDV4Q";
            proxy_pass https://scholar.google.com;
            sub_filter scholar.google.com/scholalr scholar.XXX/scholalr;
            sub_filter_once off;
        }

    }

server
    {
        listen 80;
        server_name scholar.XXX;
        rewrite ^(.*) https://scholar.XXX/$1 permanent;
    }