AlinsRan commented on PR #13676:
URL: https://github.com/apache/apisix/pull/13676#issuecomment-4977113727
Fixed in b7e61ca. You're right — `extract_last_user_message()` read
`body.messages` directly, so a Responses request (prompt in `body.input`) found
no messages and silently fell back to the catchall; same for Anthropic/Bedrock
structured content.
Now it reads the last user turn through `ai-protocols.get_messages(body,
ctx)`, which normalizes Chat, Responses, Anthropic and Bedrock into canonical
`{role, content}` entries. The protocol is already detected in `access`
(`base.detect_request_type`), so this reuses that dispatch rather than
re-parsing. Kept a small guard to flatten multimodal content the adapter may
hand back unflattened.
Added regression coverage: a Responses request (`body.input`) and an
Anthropic request (`body.system` + messages) each assert the semantic route is
picked (via the debug header) instead of falling back.
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