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Yes, I know WordPress itself switches the site to maintenance mode while updating, but is "wp-content/maintenace.php" used at that time?
I can't find any file updated around the time of errors.
"wp-content/maintenace.php" is generated by not WordPress itself but WordPress Toolkit, isn't it?
So...
Thank you for your replies.
I'm not sure what header() function does, so I looked up.
My understanding is:
1. The site is switched to the maintenance mode automatically by WordPress Toolkit for some reason.
2. Someone visited the site during the maintenance mode.
3. HTML response header is sent...
I often see following warnings in error log files:
PHP Warning: Cannot modify header information - headers already sent in (pathname)/wp-content/maintenance.php on line 16
PHP Warning: Cannot modify header information - headers already sent in (pathname)/wp-content/maintenance.php on line 17...