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Add per-connection protection against excessive early HTTP/2 stream resets. - #742
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Limit excessive early stream resets on a per-connection basis to mitigate resource exhaustion from rapid stream cancellation.
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The implementation tracks rapid
RST_STREAMactivity on peer-initiated streams and rejects excessive activity withENHANCE_YOUR_CALM.The protection reuses the existing rate limiter, remains internal to httpcore5-h2, and does not change the public API.