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I want to know about 503 response. Is it not suitable to visible whenever someone try malicious or unauthorized URL in wordpress site? How to cater this response if it is not suitable to visible? What other responses are not suitable like 503? So far wordfence catching it and blocking such input URLs
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503 is typically maintenance mode. All maintenance mode plugins will return this code. Otherwise see this https://www.wpbeginner.com/plugins/how-to-put-your-wordpress-site-in-maintenance-mode/