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Frontend Backend Correlated Logging: Browser Fetch Request IDs and Server Logs

Short answer: give each browser fetch a request ID, carry it to the backend in a standard HTTP header, and emit that same ID in structured logs on both sides.

  • Browser fetches receive unique request IDs for correlation
  • IDs passed via HTTP header to backend and included in structured logs
  • Separate flag-evaluation ID tracks pricing decisions and rule versions

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