wp super cache stopped working (after a migration from Apache to NGINX + https)

hi.

after a migration from Apache to NGINX, wp super cache stopped working
we are also now full https
here is a debug message.

any advises how to fix ?

08:01:39 5591 /wordpress-folder/my-page-url/ wp_cache_get_cookies_values: return:
08:01:39 5591 /wordpress-folder/my-page-url/ Non empty GET request. Caching disabled on settings page. {“q”:”\/wordpress-folder\/my-page-url\/”}
08:01:40 5591 /wordpress-folder/my-page-url/ wp_cache_get_cookies_values: return:
08:01:40 5591 /wordpress-folder/my-page-url/ In WP Cache Phase 2
08:01:40 5591 /wordpress-folder/my-page-url/ Created mutex lock on semaphore: 714601499
08:01:40 5591 /wordpress-folder/my-page-url/ Setting up WordPress actions
08:01:40 5591 /wordpress-folder/my-page-url/ Supercache caching disabled. Only using wp-cache. Non empty GET request. {“q”:”\/wordpress-folder\/my-page-url\/”}
08:01:40 5591 /wordpress-folder/my-page-url/ Created output buffer
08:01:40 5591 /wordpress-folder/my-page-url/ Non empty GET request. Caching disabled on settings page. {“q”:”\/wordpress-folder\/my-page-url\/”}
08:01:40 5591 /wordpress-folder/my-page-url/ wp_cache_maybe_dynamic: returned $buffer

nginx CONF

index index.php;
if (!-e $request_filename)
{
rewrite ^(.+)$ //index.php?q=$1 last;
}
if ($scheme = http) {
rewrite ^ https://$server_name$request_uri? permanent;
}
client_max_body_size 30m;
location ~ [^/]\.php(/|$) {
fastcgi_split_path_info ^(.+?\.php)(/.*)$;
fastcgi_pass unix:/var/run/php5-fpm-my_webapp.sock;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param REMOTE_USER $remote_user;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param SCRIPT_FILENAME $request_filename;