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Same Request Sent Twice: How Idempotency Prevents Duplicate Payments

A user opens a payment app, types in an amount, and taps "Pay." The spinner shows up. Then nothing — no success screen, no error, just a frozen loader. So they tap "Pay" again.

  • User retries payment request after initial request fails
  • Idempotency keys prevent duplicate charges by linking retries to original requests
  • Idempotent operations have same effect when repeated, like pressing an elevator button

Data Centers Spread Across Japan

Data center construction is accelerating across Japan as artificial intelligence drives demand for computing capacity, creating new business opportunities for domestic companies supplying…

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