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fix: drop ua-based markdown switching #71

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Merged
pamelachia merged 1 commit into from
Jul 9, 2026
Merged

fix: drop ua-based markdown switching #71

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14 changes: 1 addition & 13 deletions src/start.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,23 +5,11 @@ import { getLLMText, markdownPathToSlugs, source } from '@/lib/source';
import { getBlogLLMText, blogSource } from '@/lib/blog-source.server';
import homepageMarkdown from './content/homepage.md?raw';

const LIVE_FETCH_UA_RE =
/(?<![A-Za-z0-9])(?:Claude-User|Claude-Web|ChatGPT-User|PerplexityBot)(?![A-Za-z0-9-])/i;

function isLiveFetchAgent(request: Request): boolean {
const ua = (request.headers.get('user-agent') ?? '').slice(0, 512);
return LIVE_FETCH_UA_RE.test(ua);
}

function prefersMarkdownByAccept(request: Request): boolean {
const preferred = getNegotiator(request).mediaTypes(['text/html', 'text/markdown'])[0];
return preferred === 'text/markdown';
}

function wantsMarkdown(request: Request): boolean {
return isLiveFetchAgent(request) || prefersMarkdownByAccept(request);
}

function markdownResponse(body: string): Response {
return new Response(body, {
headers: {
Expand All @@ -40,7 +28,7 @@ const llmMiddleware = createMiddleware().server(async ({ next, request }) => {
const explicitMarkdown = pathname.endsWith(MARKDOWN_EXT);

// Explicit `.md` URLs always serve markdown; bare URLs only when the client prefers it.
if (!explicitMarkdown && !wantsMarkdown(request)) {
if (!explicitMarkdown && !prefersMarkdownByAccept(request)) {
return next();
}

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