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17de0913de
acquireVqdHeaders() discarded the upstream HTTP status of the
/duckchat/v1/status call and collapsed every non-2xx response to
{vqd4:null, vqdHash1:null}. execute() then always returned a
hardcoded 503 when the token could not be acquired, regardless of
whether DuckDuckGo actually returned 429 (rate limit), 403, or a
genuine 5xx.
This mattered beyond the confusing error message: per the resilience
contract only 408/500/502/503/504 should trip the whole-provider
circuit breaker, not 429. Mislabeling a real 429 as 503 caused the
entire ddgw/* catalog to get knocked offline for the breaker reset
window instead of a short cooldown.
Now acquireVqdHeaders()/acquireAuthHeaders() thread the real status
and Retry-After header through, and execute() surfaces a genuine 429
(with Retry-After) instead of the hardcoded 503; the 503 fallback is
kept for non-429 failures and network errors.
Regression test: tests/unit/duckduckgo-vqd-429-misclassification-6996.test.ts