Nignx proxy of Google search

upstream google {
server 216.58.216.14:443 max_fails=3;
server 216.58.216.15:443 max_fails=3;
server 216.58.216.16:443 max_fails=3;
server 216.58.216.17:443 max_fails=3;
server 216.58.216.18:443 max_fails=3;
server 216.58.216.19:443 max_fails=3;
server 216.58.216.13:443 max_fails=3;
server 216.58.216.12:443 max_fails=3;
server 216.58.216.11:443 max_fails=3;
server 216.58.216.10:443 max_fails=3;
}

server {
listen 80;
server_name so.kuai.us;

location /{
proxy_redirect https://www.google.com/ /;
proxy_cookie_domain google.com so.kuai.us;
proxy_pass https://google;
proxy_set_header Host "www.google.com";
proxy_set_header Accept-Encoding "";
proxy_set_header User-Agent $http_user_agent;
proxy_set_header Accept-Language "zh-CN";
proxy_set_header Cookie "PREF=ID=a191d336be48dd1e:U=37318d643ff36958:FF=0:LD=en:NW=1:CR=2:TM=1404885843:LM=1411980439:GM=1:SG=1:S=SM8AYO7eUgOcZa8j";
sub_filter www.google.com so.kuai.us;
sub_filter_once off;
}
}