MDN: HTTP content negotiation
platform-doc
How well we read it: read in full, on 2026-11-10
What we recorded
Cited by the play ai-answer-markdown-for-agents. Read 2026-11-10 (through a fetch tool that can summarise; spot-check exact figures). MDN on server-driven content negotiation via Accept, Accept-Encoding, Accept-Language and Vary. Does not mention markdown or AI agents; supports only the generic mechanism behind markdown-for-agents.