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feat(api): structured X-Routing-Fallback-Reason header for relay routing (#6872) (#7262)

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Diego Rodrigues de Sa e Souza
2026-07-17 10:41:30 -03:00
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parent 29bb59e18d
commit 6bb3207912
5 changed files with 66 additions and 1 deletions
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docs/reference/ENVIRONMENT.md
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@@ -1077,7 +1077,7 @@ Provider quota endpoints, network tunnels (Tailscale, Ngrok, MITM debug proxy),
| `BIFROST_STREAMING_ENABLED` | `true` | `src/app/api/v1/relay/chat/completions/bifrost/route.ts` | When true, the Bifrost sidecar route streams responses back via SSE through the gateway rather than the TS streaming executor. Set to `0` to force non-streaming JSON responses through the gateway. |
| `BIFROST_TIMEOUT_MS` | `30000` | `src/app/api/v1/relay/chat/completions/bifrost/route.ts` | Per-request timeout when proxying to the Bifrost gateway (ms). On timeout the route returns the TS relay path via the `X-Bifrost-Fallback` header. |
| `OMNIROUTE_BIFROST_KEY` | _(unset)_ | `src/app/api/v1/relay/chat/completions/bifrost/route.ts` | Alias for `BIFROST_API_KEY` (used by scripts that read the env via `OMNIROUTE_*`). `BIFROST_API_KEY` takes precedence when both are set. |
| `OMNIROUTE_RELAY_BACKEND` | `ts` / `auto` | `src/app/api/v1/relay/chat/completions/routingBackend.ts` | Relay backend for `/api/v1/relay/chat/completions`: `ts \| bifrost \| auto`. `ts` = TypeScript relay (default when Bifrost unconfigured); `auto` selects Bifrost when `BIFROST_BASE_URL` is set and `BIFROST_ENABLED` ≠ `0`, with automatic TS fallback if the sidecar is unreachable; `bifrost` forces Bifrost (strict, no fallback). Auth/rate-limit/injection-guard/allowlist always run in the Next route first. Responses carry `X-Routing-Backend` / `X-Routing-Fallback`. |
| `OMNIROUTE_RELAY_BACKEND` | `ts` / `auto` | `src/app/api/v1/relay/chat/completions/routingBackend.ts` | Relay backend for `/api/v1/relay/chat/completions`: `ts \| bifrost \| auto`. `ts` = TypeScript relay (default when Bifrost unconfigured); `auto` selects Bifrost when `BIFROST_BASE_URL` is set and `BIFROST_ENABLED` ≠ `0`, with automatic TS fallback if the sidecar is unreachable; `bifrost` forces Bifrost (strict, no fallback). Auth/rate-limit/injection-guard/allowlist always run in the Next route first. Responses carry `X-Routing-Backend` / `X-Routing-Fallback` / `X-Routing-Fallback-Reason`. |
| `RELAY_ROUTING_BACKEND` | _(unset)_ | `src/app/api/v1/relay/chat/completions/routingBackend.ts` | Accepted alias for `OMNIROUTE_RELAY_BACKEND` (same `ts \| bifrost \| auto` values). `OMNIROUTE_RELAY_BACKEND` takes precedence when both are set. |
| `OMNIROUTE_BIFROST_FAILURE_COOLDOWN_MS` | `5000` | `src/app/api/v1/relay/chat/completions/bifrostCooldown.ts` | Cooldown (ms) after a Bifrost sidecar hop fails in `auto` mode before the relay re-attempts the sidecar; it routes straight to the TS path while the cooldown lasts, then probes again. `0` disables. Only applies when `OMNIROUTE_RELAY_BACKEND=auto`. |
| `OMNIROUTE_TLS_CERT` | _(unset)_ | `bin/cli/commands/serve.mjs` | Path to a PEM TLS certificate to serve `omniroute serve` over HTTPS (equivalent to `--tls-cert`). Must be paired with `OMNIROUTE_TLS_KEY`; the standalone server then terminates TLS on the same listener (`wss://` works unchanged). Unset → plain HTTP. Providing only one of cert/key, or an unreadable path, logs a warning and stays HTTP. |