Self-Hosted OpenAI-Compatible Entry

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Self-hosted unified OpenAI-compatible entry

When enabled, OmniRoute’s existing /v1/chat/completions (and the OpenAI-compatible contract it serves) becomes a self-hosted gateway: one OpenAI-compatible request in, auto-routed to the provider of your choice through the provider adapters, with a standard OpenAI error shape out. Client code does not change.

This is the D4 (接入即用) differentiator from the RIC-697 design: the same /v1 path the OpenAI SDK already targets, backed by your own providers instead of a single vendored catalog.

Enable

Set either env var (see .env.example for both):

• OMNIROUTE_SELF_HOSTED_PROVIDERS — inline YAML document (runtime-only, not logged).
• OMNIROUTE_SELF_HOSTED_PROVIDERS_FILE — path to a YAML file.

providers.yaml

providers:
  - id: local
    kind: openai # openai | anthropic | local
    baseUrl: http://127.0.0.1:11434/v1
    model: llama3
    # apiKey: sk-...       # optional, runtime-only
  - id: claude
    kind: anthropic
    baseUrl: http://127.0.0.1:8080
    model: claude-sonnet

When either var is set, the unified entry is active for every request to /v1/chat/completions. Config present but unparseable returns 500 (it never silently falls through to cloud routing). When neither is set, the route behaves exactly as before.

Provider auto-route

Precedence (deterministic, no predictive model):

1. x-omniroute-provider: <id> header — exact provider id.
2. model prefix: provider/model (slash) or provider::model (double colon).
3. First configured provider.

The routing prefix is stripped before forwarding — upstream receives the bare model (claude-sonnet, not claude/claude-sonnet).

# via header
curl http://localhost:20128/v1/chat/completions \
  -H "x-omniroute-provider: claude" \
  -H "content-type: application/json" \
  -d '{"model":"claude-sonnet","messages":[{"role":"user","content":"hi"}]}'

# or via model prefix
curl ... -d '{"model":"claude/claude-sonnet","messages":[...]}'

Auth scaffold (D5 reserved)

Optional OMNIROUTE_SELF_HOSTED_API_KEY. When set, requests must carry Authorization: Bearer <key>. Unset = open route (loopback / trusted network), mirroring how OmniRoute’s existing local providers work. The D5 quota/quota-自治 key system is expected to take over this header.

Failure contract

• Upstream non-2xx body is normalized through parseUpstreamError + buildErrorBody into the standard OpenAI error shape (Hard Rule #12 — never raw upstream text).
• Network-level failures (connection refused / DNS / TLS) return a normalized 502 with error.message: "Upstream provider unreachable: …".
• Credential / session headers echoed upstream are stripped from every response.

Tests

tests/unit/self-hosted-entry.test.ts covers provider selection, model-prefix forwarding, header hygiene, auth, upstream-error normalization, SSE streaming passthrough, and the fall-through / misconfig paths — all over real HTTP against a local upstream.

Notes

• Self-hosted models bypass the cloud-only retirement / alias machinery by design: the divert happens before those cloud checks, so ids like local/llama3 never trip cloud-peer 410s or alias rewrites.
• Deterministic routing strategies (fallback / cooldown / cost / latency / blacklist) are M2’s scope (RIC-740) and inject into the gateway layer here. Configure them with a strategy: block — see DETERMINISTIC_ROUTING.md.

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