Nginx - Diagnostic / Debug

Send Special Header Field

location ~* ^.+.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt)$ {
    add_header X-uri "$uri";
    add_header X-debug-message "A static file was served" always;
    ...
}

Set the log level

Nginx - Log (log_format)

• Error log

error_log  {{ nginx_log_path }}/{{ fqdn }}/https-error.log fine;