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Note the new request headers in the 3.5.5 release notes #539

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Note the new request headers in the 3.5.5 release notes #539

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Note the new request headers in the 3.5.5 release notes
MichaelGHSeg Sep 22, 2026
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Merge branch 'master' into docs/header-upgrade-note
MichaelGHSeg Sep 28, 2026
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7 changes: 7 additions & 0 deletions CHANGELOG.md
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- [Fix] A `Retry-After` that will not fit in what is left of `maxRateLimitDuration` ends the episode rather than being shortened to fit. The budget was tested and then the full `Retry-After` slept on top of it, so an episode could run past its limit by up to one wait; shortening it instead would resume inside the window the server named, which it has already declined to serve, and the budget would be spent by then regardless.

# Version 3.5.5 (June 30, 2026)

> **Upgrade note: new request headers and proxy allowlists.** This version sends two
> request headers that 3.5.4 did not: `Authorization` (HTTP Basic, carrying your write
> key) and `X-Retry-Count` (on retries only). If your traffic to Segment goes through a
> proxy, gateway or WAF that allowlists request headers, add both or uploads will be
> rejected.

- [New](https://github.com/segmentio/analytics-java/pull/531) Unified HTTP response handling and retry behavior
- Retryable statuses (429, 408, 410, 460, 5xx except 501/505/511) check Retry-After header first, fall back to exponential backoff
- Retry-After supports numeric seconds and RFC 7231 HTTP-date format, capped at 300s
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