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!

[gaearon]

for some reason Claude can't fetch it at all. could this be related?

[gaearon]

here's what CC claims

[icyJoseph]

It could be yeah, the API route handler could be getting the api/md for .md + content-type header. So the path segment for the doc becomes ["api", "md", "reference"]

For some reason when Claude often strips .md from the url when passing it to the WebFetch tool, I had to explicitly prompt Claude to keep the extension.

I can have a PR in a minute, sorry about this.

[icyJoseph]

#8379 @gaearon 🙏 - Claude should be able to use https://react-dev-plum.vercel.app/reference/react/useOptimistic.md as well.