ISR test
now
last: Thu Jul 03 2025 03:35:19 GMT+0000 (Coordinated Universal Time)
next: 10秒後

You can see:
- now is current time set by your browser
- last is the time this page was rendered in SERVER (that's why 'Coordinated Universal Time')
- Keep refreshing. 'last' changes every 10 seconds, meaning the cache is updated every 10 seconds.
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