fix: exclude .txt files from markdown content negotiation rewrite#2610
Merged
Lotte-Verheyden merged 1 commit intomainfrom Mar 5, 2026
Merged
fix: exclude .txt files from markdown content negotiation rewrite#2610Lotte-Verheyden merged 1 commit intomainfrom
Lotte-Verheyden merged 1 commit intomainfrom
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The beforeFiles rewrite in next.config.mjs rewrites any path to /md-src/<path>.md when the request includes Accept: text/markdown. This causes /llms.txt (and sub-files) to 404 because /md-src/llms.txt.md doesn't exist. Many AI agent tools send broad Accept headers that include text/markdown, triggering this rewrite unintentionally. Adding (?!.*\.txt$) to the regex ensures .txt files are always served directly from public/ regardless of Accept headers.
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Summary
beforeFilesrewrite innext.config.mjsrewrites any path to/md-src/<path>.mdwhen the request includesAccept: text/markdown. This causes/llms.txtand sub-files (llms-docs.txt,llms-integrations.txt,llms-self-hosting.txt) to return 404 because/md-src/llms.txt.mddoesn't exist.WebFetch) use intermediary fetching services that send broadAcceptheaders includingtext/markdown, triggering this rewrite unintentionally.(?!.*\.txt$)to the regex so.txtfiles are always served directly frompublic/regardless ofAcceptheaders.Reproducer:
curl -H "Accept: text/markdown" https://langfuse.com/llms.txt→ 404 (should be 200)