Проблему решил c помощью https://stackoverflow.com/questions/17609472/really-logging-the-post-request-body-instead-of-with-nginxby O40Qx - Php-fpm Mailing List - Russian
Аналогичная проблема. в /etc/nginx/nginx.conf http { log_format requestbody '$remote_addr - $remote_user [$time_local] ' '"$request" $request_body $status $body_bytes_sent ' '"$http_referer" "$http_user_agent"'; } в /etc/nginx/sites-available/mydomain.com server { listen 443 ssl;by O40Qx - Php-fpm Mailing List - Russian