Why can the domain name before the modification of the domain name of the website visit my website normally?

I have changed my domain name, but the previous domain name can continue to visit the website. what is wrong with this?

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Aug.31,2021

because your virtual host is configured with default virtual host , if there is no server_name match, you will use this virtual host to respond


modify the original domain name to IP
and prohibit domain names that are not allowed to be mapped to this server.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e62001-4597c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e62001-4597c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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