feat: Add Accept header content negotiation for markdown (#8272)

next.config.js

@@ -21,6 +21,20 @@ const nextConfig = {
   },
   async rewrites() {
     return [
+      // Serve markdown when Accept header prefers text/markdown
+      // Useful for LLM agents - https://www.skeptrune.com/posts/use-the-accept-header-to-serve-markdown-instead-of-html-to-llms/
+      {
+        source: '/:path*',
+        has: [
+          {
+            type: 'header',
+            key: 'accept',
+            value: '(.*text/markdown.*)',
+          },
+        ],
+        destination: '/api/md/:path*',
+      },
+      // Explicit .md extension also serves markdown
       {
         source: '/:path*.md',
         destination: '/api/md/:path*',