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Integration
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A 502 in your PDF-to-LLM pipeline is the gateway, not the model
Business Central sends a PDF through an AI gateway and gets a flat 502. The instinct is to blame the prompt. Don't — the model never saw your document. Here's how to bisect the pipeline and force a text-extraction path that works.
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Calling AI from Business Central: the platform realities nobody warns you about
Your AL HttpClient call to an AI endpoint returns send=false and no error. It's not your code — it's three platform guardrails (the HttpClient flag, the anti-SSRF allowlist, and loopback hostnames) that fail silently. Here's the checklist.
