feat(passthrough): per-request envelope detection, drop protocol/streaming config - #986
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…l/streaming config Remove the passthrough route's two pre-release knobs (the kind first ships in 0.10.0, so nothing released carries them): - `protocol` is gone. The envelope is detected once per exchange from the request body's top-level keys (`messages` -> chat, `input` -> Responses, `prompt` -> completions, anything else -> opaque) and drives guardrail extraction, capture, and usage for the request, the buffered response, and every stream frame. Detection never affects the relay, and an envelope that yields no text falls back to whole-body scanning, so a detected request is never scanned more narrowly than an opaque one. Opaque buffered responses are still not probed for usage (no phantom tokens from usage-shaped REST bodies). - `streaming` is gone. SSE upstream responses always relay incrementally; everything else buffers (guardrails and usage need the whole body). The exchange timeout keeps its streaming-safe semantics: header phase + non-SSE body reads, never a healthy relay. This collapses the forward-proxy Copilot setup to a single route: the CLI's /responses turns, FIM completions, MCP JSON-RPC and GitHub REST all sort themselves out per request with no per-protocol routes. E2E: new envelope-auto-detection case asserts, via a real OTLP exporter, that a route with no protocol config records chat usage from a buffered body and Responses usage from the terminal stream event, and that JSON-RPC traffic records zero tokens.
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📝 WalkthroughWalkthroughPassthrough routes no longer configure protocol or streaming behavior. The proxy detects request envelopes per exchange, extracts content and usage, relays bodies unchanged, and applies explicit timeout handling. Unit and end-to-end tests cover supported envelopes and raw fallback. ChangesPassthrough envelope detection
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change may drop slow SSE responses and lose request-scoped telemetry, while the readiness test can hide upstream failures instead of reporting them directly. Merge should wait until these issues are fixed or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant Client
participant PassthroughRoute
participant Upstream
Client->>PassthroughRoute: Send request body
PassthroughRoute->>PassthroughRoute: Detect envelope and extract request content
PassthroughRoute->>Upstream: Relay original request body
Upstream-->>PassthroughRoute: Return response
PassthroughRoute->>PassthroughRoute: Extract response content and usage
PassthroughRoute-->>Client: Relay original response
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In `@crates/aisix-proxy/src/passthrough_route.rs`:
- Around line 810-812: Update the SSE branch in the passthrough route to wrap
the stream passed to stream_response with crate::request_id::in_request_span and
crate::sse_keepalive::with_heartbeat using crate::sse_keepalive::interval().
Preserve the existing SSE response behavior while ensuring heartbeat keepalives
and request-span telemetry apply to the relayed stream.
In `@tests/e2e/src/cases/passthrough-route-e2e.test.ts`:
- Around line 581-592: Replace the chat-completions readiness probe inside
waitConfigPropagation with an independently authenticated GET /v1/models request
using the seeded caller key, consume the response body, and require status 200.
Remove the catch-all that converts request failures into false; allow
non-readiness errors to propagate while keeping the later chat request as the
behavior under test.
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crates/aisix-core/src/lib.rscrates/aisix-core/src/models/mod.rscrates/aisix-core/src/models/passthrough_route.rscrates/aisix-core/src/models/schema.rscrates/aisix-proxy/src/passthrough_route.rsschemas/resources/passthrough_route.schema.jsontests/e2e/src/cases/passthrough-route-e2e.test.ts
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… gate in e2e The relay stream now composes with_heartbeat + in_request_span like every typed streaming endpoint (pre-existing gap from the redesign, surfaced on review). The envelope-detection e2e gates readiness on a sentinel route seeded last instead of probing an exchange the test asserts on, and fires the chat measurement explicitly.
Removes the passthrough route's
protocolandstreamingfields and replaces the protocol hint with per-request envelope detection. Both fields are pre-release surface: thepassthrough_routeskind first ships in 0.10.0, so no released DP or CP ever carried them.What changes
Envelope detection replaces
protocol. The request body's top-level keys identify the envelope once per exchange —messages→ chat,input→ Responses API,prompt→ completions/FIM, anything else (MCP JSON-RPC, REST, non-JSON, empty/GET bodies) → opaque. The detection is sticky for the exchange: the buffered response and every stream frame are read with it. It drives guardrail text extraction, audit capture, and usage extraction only — the relayed bytes are never modified.Safety properties:
messages/input/promptare each the required carrier field of exactly one API), so real traffic detects unambiguously.usage-shaped object records no phantom tokens. (Opaque SSE streams keep the existing top-level usage probe.)streamingis removed. SSE upstream responses always relay incrementally; non-SSE responses always buffer (guardrails and usage need the whole body). The exchange timeout keeps the streaming-safe semantics: it bounds the send/header phase and non-SSE body reads via an explicit timer and never bounds a healthy SSE relay.Why
The Copilot CLI verification (#984/#985) showed the per-protocol config pushes upstream API knowledge onto the operator: one host serves chat + Responses + MCP under different paths, forcing route splits whose only purpose was carrying different
protocolvalues — and a route left on the wrong value silently recorded zero tokens for all agent traffic. With detection, the whole Copilot forward-proxy setup is one route, and the zero-token failure mode is structurally gone.Tests
detect_protocolover the real Copilot traffic shapes (chat/Responses both forms/FIM/JSON-RPC/REST/wrong-typed carrier keys/empty), empty-extraction fallback, and strict-schema rejection of the removed fields (lenient path tolerates-and-strips).passthrough-route-e2e): new case drives three identical-config routes through a real gateway + OTLP exporter and asserts chat usage extracted from a buffered body (7/3), Responses usage from the terminalresponse.completedstream event (11/4), and zero tokens for JSON-RPC traffic whose response embeds a usage-shaped object.schemas/resources/passthrough_route.schema.jsonregenerated. CP counterpart PR removes the fields from cp-admin.yaml, the projection, and the dashboard.Summary by CodeRabbit
New Features
Breaking Changes
protocolandstreamingroute settings.Bug Fixes