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Cloudflare engineers spent six weeks debugging a race condition in the hyper Rust HTTP library that caused silent data truncation in large image responses. The root cause was a single `let _ =` discarding a `Poll::Pending` signal during flush; the fix was a four-line change now merged upstream.
Cloudflare engineers uncovered a race condition bug in the hyper HTTP library while debugging intermittent failures in their Images service, where large image transformations returned truncated responses. The fix required only four lines of code.