Thanks for your reply.
The plugin was uninstalled from WP backend.
htaccess and wp_config don’t have any code from the plugin
Site url is http
Browser cache is clean
And, after all, the http -> https redirection is still there.
Following your knowledge-base link I just found how to change site url in the database, I will check the current value.
Just one more question…
If you have uninstalled by just removing the plugin through FTP, your site url will still be https (in settings/general). This will cause WordPress to redirect your site to https.
Is WordPress redirecting the http requests to https by itself if settings/general are pointed to https version?