fix(frontend): return the generate route's own error envelope on bad input - #13696
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fix(frontend): return the generate route's own error envelope on bad input#13696ayaangazali wants to merge 2 commits into
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`/inference/v1/generate` answers every failure it produces itself with a
vLLM-style nested envelope, and its tests assert that shape:
{"error":{"message":"...","type":"not_found","code":404}}
Requests that fail before reaching the handler did not get it. The route used
Axum's `Json` extractor, whose rejections are `text/plain`, so the two most
common client mistakes came back unparseable:
Content-Type: text/plain -> 415 text/plain Expected request with `Content-Type: application/json`
body "{not json" -> 400 text/plain Failed to parse the request body as JSON: ...
`smart_json_error_middleware` does not cover these. It only rewrites 422 to
400, and neither rejection is a 422.
Read the body explicitly instead and report all three failure modes through
`generate_error_response`, the same helper the rest of the route uses:
unsupported media type, oversized body, and malformed JSON.
Content-type parsing reuses `is_json_content_type` from the openai module
rather than reimplementing it, so this route keeps the same notion of what
counts as JSON, including parameters and `+json` suffixes. That function is
now `pub(super)`; `generate.rs` already imports `get_body_limit` from there.
The policy is unchanged, only the envelope: an absent `Content-Type` is still
rejected, exactly as `ensure_json_content_type` does today.
Signed-off-by: ayaangazali <ayaangazali.work@gmail.com>
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WalkthroughThe Generate handler now manually reads request bodies, validates JSON content types and body size, maps parsing failures to structured errors, and parses requests before downstream checks. Tests cover invalid content types and malformed JSON. ChangesGenerate request parsing
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change is localized to structured error responses, with no supplied evidence of production-impacting defects. One minor test assertion follow-up remains, but no actionable merge-blocking risk is present. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 1
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Inline comments:
In `@lib/llm/src/http/service/generate.rs`:
- Around line 1253-1267: Add a response Content-Type assertion to
generate_route_malformed_json_returns_structured_400, matching the
application/json media-type check used by the existing 415 test while preserving
the current status and body assertions.
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The 415 test asserted the response `Content-Type` and the 400 test did not,
which left the two halves of the same contract checked differently.
It also mattered more than symmetry here. The status was already 400 before
this change, so status alone cannot tell the two behaviours apart; without the
media-type assertion the test only failed indirectly, when `resp.json()` choked
on a `text/plain` body. It now fails on the contract it is actually testing.
Both tests confirmed red against the unfixed handler:
the 415 must use this route's JSON envelope, not Axum's text/plain rejection
the 400 must use this route's JSON envelope, not Axum's text/plain rejection
Raised by CodeRabbit on ai-dynamo#13696.
Signed-off-by: ayaangazali <ayaangazali.work@gmail.com>
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Summary
/inference/v1/generateanswers every failure it produces itself with a vLLM-style nested envelope, and its own tests assert that shape:{"error":{"message":"no generate-capable model is registered","type":"not_found","code":404}}Requests that fail before reaching the handler did not get it. The route used Axum's
Jsonextractor, whose rejections aretext/plain, so the two most common client mistakes came back unparseable. Measured onmain:A client written against the documented envelope parses the third and throws on the first two.
smart_json_error_middleware, which this router already layers on, does not cover them: it only rewrites 422 to 400, and neither rejection is a 422. I checked that rather than assuming the middleware was doing the job.The fix reads the body explicitly and reports unsupported media type, oversized body and malformed JSON through
generate_error_response, the helper the rest of the route already uses.Content-type parsing reuses
is_json_content_typefrom the openai module instead of reimplementing it, so this route keeps the same notion of what counts as JSON, including parameters and+jsonsuffixes. That function becomespub(super);generate.rsalready importsget_body_limitfrom the same place.The policy is unchanged, only the envelope. An absent
Content-Typeis still rejected, matchingensure_json_content_typetoday. Worth noting @chanh has #13268 open to treat an absent header as JSON; if that lands, this route should follow it, and reusing the shared helper is what makes that a one-place change.This is the same class as #13685 but a different module and a different envelope, so it is deliberately not a copy:
generate.rsuses{"error": {...}}where the openai routes use a flat{message, type, code}.Validation
Behaviour measured before and after by driving the route through its existing
serve()test harness:Content-Type: text/plain415 text/plain415 application/json{"error":{...,"code":415}}{not json400 text/plain400 application/json{"error":{...,"code":400}}404nested envelopeAdded
generate_route_bad_content_type_returns_structured_415andgenerate_route_malformed_json_returns_structured_400, alongside the route's existing structured-error tests, asserting the responsecontent-typeas well as the body since the status codes were already correct and only the shape was wrong.main, which is exactly the two tests added.cargo clippyandcargo fmt --all -- --checkclean.Two pre-existing issues I ran into and am not fixing here, disclosed so the numbers make sense:
test_oversized_body_returns_json_413fails intermittently, roughly half the time in isolation. Same rate on cleanmain; I reported it on #13624. It is the only failure in the non-clean full-suite runs above.The
generate_route_*tests fail under parallel execution. I confirmed this is pre-existing rather than caused by the two tests I added: with my changes reverted,cargo test generate_route_fails 4 of 8 on cleanmain, while serialized with my tests included it is 10 of 10. It does not surface in a full-suite run, and fixing that harness is a separate change from this one.Not verified here: no GPU, so the success path of
/inference/v1/generatewas not exercised end to end. This change only affects how the request body is read and how that read is reported when it fails.Summary by CodeRabbit