set $group "default";
if ($http_cookie ~* "version=1.0"){
set $group version1.0_server;
}

if ($http_cookie ~* "version=2.0"){
set $group version2.0_server;
}

location /api {
rewrite ^/api/(.*)$ /$1 break;
proxy_pass http://$group;
}

location /static{
proxy_pass https://$group.com;
}

一套简单的灰度
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