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## Why A WebSocket close with code `1009` before any text arrives indicates that the request exceeds the peer's message size limit. Retrying the request over another WebSocket does not address that limit. ## What changed - Classify these early size rejections as requiring HTTP fallback and switch transports without exhausting WebSocket retries, including during prewarming. - Preserve ordinary stream retry behavior for size closes after any text frame and for other close codes. ## Testing Add integration coverage for early size rejections during generation and prewarming, size closes after metadata, rate limits, or response creation, and ordinary closes. GitOrigin-RevId: 4550d289bb414fec1faae2a195bcc635d394117b