Waymark / Routes / OpenAI-compatible Troubleshoot common OpenAI-compatible endpoint request errors (400, 401, 404 model not found, 429, context length)
domain: OpenAI-compatible · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Confirm the URL is exactly `<base>/v1/chat/completions` where base is the host (e.g. http://localhost:8000), not a base already ending in /v1. On 401/403 check `Authorization: Bearer <KEY>` and the right key for that server (Ollama accepts any value; vLLM enforces only with --api-key). On 404 'model not found', GET /v1/models and use an exact id from `data[].id`. On 429 you are rate-limited/at capacity; add backoff or raise server concurrency (vLLM --max-num-seqs). On context-length errors, trim messages / lower max_tokens, or switch to a larger-context model. Known gotchas A 400 on Ollama usually means an unsupported field (tool_choice, logit_bias, user, n) — drop it. Double-check you did not append /v1 twice (…/v1/v1/chat/completions → 404). Docs: https://docs.ollama.com/openai and https://docs.vllm.ai/en/stable/serving/online_serving/openai_compatible_server/
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