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Jason ead9e22b21 feat: convert Codex Chat error responses to Responses envelope
The Codex Chat-to-Responses bridge already rewrites successful upstream
responses to the Responses shape, but the error branch in
handle_codex_chat_to_responses_transform passed Chat-shaped error bodies
through untouched (MiniMax base_resp, raw OpenAI Chat error, text/plain
"Unauthorized" pages, etc.), leaving Codex clients unable to recognize the
error.

Add chat_error_to_response_error in transform_codex_chat to regularize all
upstream error shapes into the standard {error: {message, type, code, param}}
envelope, then wire it through a new handle_codex_chat_error_response that
preserves the original HTTP status code. Non-JSON error bodies (HTML, plain
text) are wrapped as Value::String and truncated to 1KB at a UTF-8 char
boundary to keep diagnostic context without flooding the response.

Also fix a pre-existing append-vs-insert pitfall in three rebuilt-body
branches (Claude transform, Codex Chat normal, Codex Chat error): http
Builder::header is append, so leaking the upstream Content-Type produced
two Content-Type headers when the rewritten body was JSON. Remove the
upstream value before writing application/json.
ead9e22b21 · 2026-05-25 22:20:33 +08:00
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