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A bare "image/*" Accept paired with the tessera/1.0 User-Agent tripped Cloudflare bot mitigation on some sites -- caught live testing against chatgpt.com/favicon.ico, which returned 403 with this combo but 200 with a realistic browser-style image Accept list. Isolated via direct fetch comparison inside the API container before landing the fix. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>