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- Forward upstream response metadata as HTTP response headers: initial metadata and trailers of a successful call, the metadata of a trailers-only error, and the initial metadata of a server stream. grpc-*, -bin, content-type, hop-by-hop/framing keys and x-http-code are never forwarded; an operator deny-list (response_headers.deny, ProxyServer::with_denied_response_headers) drops more - Set the status of a successful unary call from x-http-code (200-599); an invalid value becomes the malformed-upstream INTERNAL (500) - Carry google.api.HttpBody raw bodies in both directions, including server-streaming chunks; make httpbody.proto resolvable for details - Parse HttpRule.custom: any method token, and kind "*" for every method - Answer only real CORS preflights (OPTIONS with Access-Control-Request-Method) in the CORS layer; every other OPTIONS reaches its route. The CORS layer used to answer any OPTIONS with 200, which let an unauthenticated OPTIONS pass the forward-auth endpoint - OpenAPI reads bindings from the same parser as routing (additional_bindings, custom rules, unique operationIds) and maps body/query by the body rule; HttpBody is raw content - Mount server-streaming bindings on any method and under aliases - Serialize JSON responses without an intermediate value tree Closes #92
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📝 SummarySummary by CodeRabbit
WalkthroughThe proxy now supports upstream-controlled HTTP headers and status codes, raw ChangesHTTP transcoding
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Client as HTTP client
participant Proxy as ProxyServer transcoder
participant Upstream as tonic gRPC upstream
Client->>Proxy: Send request body and Content-Type
Proxy->>Upstream: Send mapped request or HttpBody
Upstream-->>Proxy: Return response, metadata, and trailers
Proxy-->>Client: Send HTTP status, headers, and body
Merge Risk: 🟡 Moderate · up to Endpoints whose response_body names a multi-word field, such as Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The proxy gives upstream services substantially more control over HTTP responses and passes raw bodies for selected routes. The code includes important filtering and error handling, but the safety of the new authority depends on which upstreams and routes are trusted in deployment. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Out of Scope Changes checkExplanation Most auxiliary changes support ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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In @src/transcode/mod.rs:
- Around line 435-460: Update json_body to resolve each response_body segment
against the current message descriptor, then use the matched field’s json_name()
to remove its serialized JSON value while advancing the descriptor for nested
message fields. Add a test covering a multi-word proto field name.
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Cargo.tomlREADME.mdsrc/auth/verifier.rssrc/config.rssrc/config/tests.rssrc/cors.rssrc/cors/tests.rssrc/lib.rssrc/openapi.rssrc/openapi/tests.rssrc/transcode/error.rssrc/transcode/error/tests.rssrc/transcode/httpbody.rssrc/transcode/httpbody/tests.rssrc/transcode/mod.rssrc/transcode/response.rssrc/transcode/response/tests.rssrc/transcode/rule.rssrc/transcode/rule/tests.rssrc/transcode/tests.rstests/common/mod.rstests/hooks.rstests/upstream_controls.rs
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Comments Outside DiffThese findings sit on lines the diff does not cover, so they could not be posted inline. Each one leaves this list once its file changes.
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- CORS: a preflight needs Origin as well as
Access-Control-Request-Method; any other OPTIONS reaches its route
- Raw HttpBody field: a query key naming the body field no longer binds
into it (the body wins over the query, as for a parsed body)
- Aliases run through the same path-template conversion as the route
they alias ({path=**} becomes {*path})
- response_body segments resolve through proto field names, not the
serialized JSON keys, so multi-word fields no longer yield null
- 205 Reset Content carries no content or Content-Type (RFC 9110
§15.3.6), like 204 and 304
- A call that fails after the upstream sent response headers keeps their
metadata on the error response, ahead of the failure's own
- OpenAPI registers the schema of message-typed query parameters
Each fix carries a regression test that failed before it.
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- Extension-method fallback picks the binding by method before reading anything, so an unbound method gets its 405 without its body being buffered (it could get 413 instead) - An HttpBody input with body "*" binds nothing from the query: every field comes from the raw body, and a stray query key no longer fails the request - OpenAPI: a self-referencing message is registered once and referenced instead of recursing until the stack overflows (router build aborted) - OpenAPI: HEAD operations describe no response content - OpenAPI: a JSON response_body is described by the selected field's schema, not the whole response message Each fix carries a regression test that failed before it.
| let schema = match response_field(&output, path) { | ||
| Some(field) => { | ||
| register_nested(&field, schemas); | ||
| field_to_schema(&field) |
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When an upstream leaves a message field selected by response_body unset, the proxy returns JSON null. The new OpenAPI schema describes only the referenced message type, so generated clients may reject a valid response. This contract mismatch is non-blocking.
Artifacts
Authored Rust test for an unset selected message response
- The test starts a real tonic upstream, requests both proxy endpoints, and checks the null response against the generated schema.
Authored command for parent-version and current-version runs
- The command temporarily substitutes the parent `src/openapi.rs`, runs the same test twice, captures both outputs, and restores the current source.
Parent-version endpoint responses
- The executed test recorded HTTP 200 OK for both endpoints, a `Reply` schema, and a JSON null response.
Current-version endpoint responses
- The executed test recorded HTTP 200 OK for both endpoints, a nonnullable `Child` schema, and a JSON null response, confirming the contract mismatch.
1 participant
Summary
The upstream RPC now decides the HTTP answer where a protocol needs it, as with Envoy's
grpc_json_transcoderand grpc-gateway. An OAuth 2.0 / OIDC provider, redirects, JWKS and forward-auth work as gRPC. The proxy carries the decision and adds no protocol logic.Response metadata → response headers. Covers initial metadata and trailers of a successful unary call, the metadata of a failed call (trailers-only, or headers plus trailers when it fails after sending headers, so a
401carries itsWWW-Authenticate), and initial metadata of a server stream. Repeated values stay in order; a key in both initial metadata and trailers keeps both values. Never forwarded:grpc-*,-bin,content-type, hop-by-hop/framing fields (RFC 9110 §7.6.1),x-http-code. Operators can drop more keys with a deny-list:response_headers.denyin YAML orProxyServer::with_denied_response_headers. An error whose details are malformed forwards none of its metadata.x-http-codesets the status of a successful unary call. It must be exactly three digits in 200-599 and appear once; anything else becomes the malformed-upstreamINTERNAL(500) with nothing else from the upstream.204,205and304carry no content (RFC 9110 §15.3.5, §15.3.6, §15.4.5).google.api.HttpBodyworks both ways:response_bodyfield: raw body with itsContent-Typebody: "*": raw request body and its fullContent-Type, with nothing bound from the querybodyfield of that type: same, and the other fields come from path and query (a query key naming the body field is ignored)Content-Typefrom the first message; a failure after the first message aborts the transferData moves without copying.
google/api/httpbody.protois always resolvable for error details.HttpRule.custombinds any method token (case-sensitive, RFC 9110 §9.1):HEAD,OPTIONS, or an extension method such asPROPFIND. An unbound method gets 405 with a fullAllow(RFC 9110 §15.5.6) before its body is read.kind: "*"binds every method. It also works inadditional_bindings. A*rule next to another binding on its path is rejected at startup.Fixes along the way
OPTIONS. tower-http'sCorsLayeranswered everyOPTIONSwith 200, soOPTIONS /auth/verifywithout credentials passed the gate. Now only a real preflight (OPTIONSwith bothOriginandAccess-Control-Request-Method, Fetch §3.2.2) is answered by the CORS layer. Any otherOPTIONSreaches its route and still gets CORS response headers.additional_bindingsandcustomrules (*under every operation), with uniqueoperationIds;bodyrule instead of the HTTP method;response_bodyis described by the selected field's schema, and HEAD operations describe no response content;*/*binary content.response_bodyresolves proto field names (user_info), not serialized JSON keys.serde_json::Valuetree.response_bodymoves the subtree instead of cloning it.Behaviour changes to note
bodyrule no longer shows arequestBody; its fields are query parameters.invalid transcoding config.Testing
fmt, clippy with
-D warnings, the test suite and doc tests pass on every CI leg (rust_crypto,aws_lc_rs, injected verifier, all features), and rustdoc builds without warnings.tests/upstream_controls.rsruns the proxy against a real tonic upstream.Closes #92