Capturing the request path to debug a 404 from the OpenAI Node SDK baseURL

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A 404 from an SDK call does not reveal which URL the client actually requested, so the author suggests first checking the exact request path. The tutorial runs the OpenAI Node SDK against a local HTTP fixture on the developer's machine, requiring no model account or real API key. The fixture accepts only /v1/chat/completions and records the method, path, and model field for each request. Five baseURL configurations are tested, including the common mistake of including the full endpoint in baseURL. The author notes that a fixture 404 only shows a route mismatch in the test setup, not a provider outage or unsupported model, and tested with Node.js v26.0.0 and openai 7.38.0.

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