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## Why Requests that exceed the server's advertised WebSocket message size limit can fall back to HTTP without first uploading the oversized message. ## What changed Read `x-codex-websocket-max-message-bytes` from the handshake response and check the serialized request's byte length before sending. Route oversized requests through the existing HTTP fallback. Ignore missing or invalid limits, and remove the close-code-specific wording from the size-limit error. ## Testing Add a fallback test that advertises a one-byte limit and verifies zero WebSocket generation requests and one HTTP request. GitOrigin-RevId: 03b42012ca77d6b046e937fef8e6335d855a1c10