Is the origin in the request header displayed only when cors is cross-domain?

is the origin in the request header displayed only when cors is cross-domain? Is there no other cross-domain approach? What does this mean?

Ajax http java javascript
Jul.31,2021

https://developer.mozilla.org.

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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-64f5-1eac842-20e0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eac842-20e0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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