Aias00 opened a new issue, #7907:
URL: https://github.com/apache/shenyu/issues/7907
### Behavior and reproduction
The response-transformer system prompt requests a complete HTTP/1.1 response
including its status line. The plugin applies the generated headers/body but
never applies that status.
At `fda742c48e7f553c9964cf74b36732326d0fde00`, use the real response
decorator with upstream status 200 and a mocked ChatClient emitting:
```http
HTTP/1.1 404 Not Found
Content-Type: application/json
{"error":"missing"}
```
Observed response: **200 OK** with body `{"error":"missing"}`. The generated
404 is silently discarded. This was executed with Spring MockServerWebExchange
and the actual writeWith/parser path; no live model is required.
### Location and cause
- [System prompt explicitly includes a status
line](https://github.com/apache/shenyu/blob/fda742c48e7f553c9964cf74b36732326d0fde00/shenyu-plugin/shenyu-plugin-ai/shenyu-plugin-ai-response-transformer/src/main/java/org/apache/shenyu/plugin/ai/transformer/response/template/AiResponseTransformerTemplate.java#L52)
- [Apply only extracted headers and
body](https://github.com/apache/shenyu/blob/fda742c48e7f553c9964cf74b36732326d0fde00/shenyu-plugin/shenyu-plugin-ai/shenyu-plugin-ai-response-transformer/src/main/java/org/apache/shenyu/plugin/ai/transformer/response/AiResponseTransformerPlugin.java#L363)
The parser skips the HTTP status line, and no generated status reaches
setStatusCode before commit.
### Expected behavior / suggested repair
Define and implement status handling consistently with the advertised
full-response contract. Parse and validate a generated status before committing
(or explicitly constrain the feature/prompt to preserve the upstream status).
Retain the upstream status for omitted/invalid output. Regress 404, a success
status, invalid codes, and no-content status/body semantics.
### Scope / related issues
Functional HTTP contract mismatch, medium severity. Distinct from #6756
(mutating headers before validating a generated body) and #6773 (null existing
status during prompt construction). Deduped against current open PRs and issue
history.
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