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Finagle v18.9.1 Release Notes

  • 💥 Breaking API Changes

    
* 0️⃣ finagle-base-http: `DefaultHeaderMap` now validates HTTP Header names and
  values in `add` and `set`. `addUnsafe` and `setUnsafe` have been created to
  allow adding and setting headers without validation. ``PHAB_ID=D217035``

* 🚚 finagle-core: Remove slow host detection from `ThresholdFailureDetector`.
  ``PHAB_ID=D210015``

⚙ Runtime Behavior Changes

    • 👻 finagle-core: When Finagle would exhaust a retry budget with an exception that was not a FailureFlags, previously it would wrap that exception with a non-retryable failure. This lead to surprising behavior for users. Those exceptions will no longer be wrapped. PHAB_ID=D216281

    • finagle-http: The finagle HTTP clients and servers now consider a Retry-After: 0 header to be a retryable nack. Servers will set this header when the response is a retryable failure, and clients will interpret responses with this header as a Failure.RetryableNackFailure. PHAB_ID=D216539