Accept header negotiation beforeFiles

[icyJoseph]

On the deployed version, the rewrite has to be declared to happen beforeFiles.

You can try this the fix out here: https://react-dev-sepia.vercel.app/ - I'll tear the link/project down after this lands.

# 1. Normal page request (should return HTML)
curl -s https://react-dev-sepia.vercel.app/learn/thinking-in-react | head -5

# 2. With Accept: text/markdown (should return markdown)
curl -s -L -H "Accept: text/markdown" https://react-dev-sepia.vercel.app/learn/thinking-in-react | head -15

# 3. Explicit .md extension (should return markdown)
curl -s https://react-dev-sepia.vercel.app/learn/thinking-in-react.md | head -15

# 4. /llms.txt normal (should return sitemap)
curl -s https://react-dev-sepia.vercel.app/llms.txt | head -10

# 5. /llms.txt with Accept: text/markdown (should still return sitemap)
curl -s -L -H "Accept: text/markdown" https://react-dev-sepia.vercel.app/llms.txt | head -10

[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

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This PR introduced no changes to the JavaScript bundle! 🙌

[rickhanlonii]

Sick thank you!

[rickhanlonii]

Works great, thanks @icyJoseph!