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Jamie WongandClaude Opus 4.7
b34cc71bee
Case B: when a slot wait flushes SSE ping comments first (Writer.Written becomes true), the previous ensureForwardErrorResponse short-circuited on `c.Writer.Written()` and returned false without notifying the client. Subsequent upstream errors (http2 timeout, stream INTERNAL_ERROR, etc.) produced silent EOF; Codex CLI reported "stream closed before response.completed" just like the user-slot timeout case. Remove the Written() early return; coerce streamStarted to true when Writer has already been written to, and let handleStreamingAwareError walk the existing logic — which now (thanks to the previous commits) emits a protocol-compliant response.failed for /responses paths and the legacy `event: error` for others. Update tests that previously asserted "do not override written response": the new contract is to *append* an SSE terminal frame so the client sees a clean close instead of EOF. recoverResponsesPanic inherits this fix. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>