Three Headers Of The Anthropic API
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A minimal Anthropic API request has three required HTTP headers: _____(1), _____(2), and the standard _____(3). Fill the 3 blanks (lowercase, hyphens intact). Flag format: CONGRESS{1:[header],2:[header],3:[header]}. Example: CONGRESS{1:x-api-key,2:anthropic-version,3:content-type}.
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One auth, one vendor spec, one MIME.
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