gzip compression not working - ubuntu + vesta, apache + nginx?

Question

Nginx

Hello everyone, we have a server in ubuntu + vesta, apache + nginx, for some reason gzip compression does not work, I check the site pages here https://www.cy-pr.com/tools/gzip/ , can you tell me what could be the reason , in the nginx settings everything seems to be in order

# Compression
gzip on;
gzip_static on;
gzip_variable on;
gzip_comp_level 6;
gzip_min_length 1024;
gzip_buffers 16 8k;
gzip_types text/plain text/css text/javascript text/js text/xml application/json application/javascript application/x-javascript application/xml application/xml+rss application/x-font-ttf image/svg+xml font/opentype ;
gzip_proxied any;
gzip_disable "MSIE [1-6]\.";