How does nodejs save the res.json in a get request to the browser cache

app.get ("/ filter", (req, res) = > {

)
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.json(req.headers.realclientip || req.ip);    
});
res.json
Dec.28,2021
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-64f5-1b3ff01-2c4c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3ff01-2c4c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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