Cloudflare edge worker for Markdown negotiation + Markdown 404 (not deployed)

_cloudflare/README.md

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+# Cloudflare in front of 207studio.dev (plan)
+
+Goal: fix the two is-agentic essentials GitHub Pages cannot do: `Accept: text/markdown` answers in Markdown with `Vary: Accept`, and a Markdown 404 body.
+
+State on 2026-10-23 12:40 KST: registrar Spaceship, nameservers `launch1/launch2.spaceship.net`, DNSSEC ON (DS keyTag 27026), A = GitHub Pages 185.199.108-111.153, MX iCloud, TXT: SPF iCloud, apple-domain, anthropic-domain-verification. No Cloudflare account in Kiwi.
+
+## Steps (유일 님 = needs login/signup; agent can do the rest once logged in)
+1. 유일 님: create/log in to a Cloudflare account (Free plan, no card needed) and add site `207studio.dev`. Cloudflare imports DNS; check A×4, MX×2, TXT×3 are all there (MX/TXT "DNS only").
+2. 유일 님: in Spaceship, turn DNSSEC off (remove DS record) FIRST. Wait for the DS to disappear (up to 24 h). Changing nameservers with the old DS still published breaks the domain and mail.
+3. 유일 님: in Spaceship, change nameservers to the two Cloudflare gives.
+4. When the zone is Active: SSL/TLS mode Full; GitHub Pages "Enforce HTTPS" stays on.
+5. Deploy this worker: `npx wrangler login` (유일 님 browser) then `cd _cloudflare && npx wrangler deploy`. Route `207studio.dev/*`.
+6. Optional: re-enable DNSSEC in Cloudflare and add its DS record at Spaceship.
+7. Check: `curl -sI -H 'Accept: text/markdown' https://207studio.dev/` → `content-type: text/markdown`, `vary: Accept`; `curl -s -H 'Accept: text/markdown' https://207studio.dev/nope` → 404 Markdown. Then is-agentic Rescan.
+
+Rollback: delete the worker route, or switch nameservers back to `launch1/launch2.spaceship.net` (DNS records stay at Spaceship).

_cloudflare/worker.js

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+// 207studio.dev edge worker: Markdown for agents in front of GitHub Pages.
+// Accept: text/markdown -> Markdown body (Vary: Accept on every response).
+// Subrequests to the same hostname go to the origin (GitHub Pages) without re-entering the worker.
+const NOT_FOUND_MD = `# 404: page not found
+
+This page does not exist on 207studio.dev.
+
+- All products: https://207studio.dev/products/
+- Product list for AI agents: https://207studio.dev/llms.txt
+- Full reference with prices and buy links: https://207studio.dev/llms-full.txt
+- Contact: support@207studio.dev
+`;
+
+function wantsMarkdown(req) {
+  const a = (req.headers.get("Accept") || "").toLowerCase();
+  return a.includes("text/markdown") || a.includes("text/x-markdown");
+}
+
+function md(body, status = 200) {
+  return new Response(body, {
+    status,
+    headers: {
+      "Content-Type": "text/markdown; charset=utf-8",
+      "Vary": "Accept",
+      "Cache-Control": "public, max-age=300",
+    },
+  });
+}
+
+function htmlToMarkdown(html) {
+  let s = html.replace(/<(script|style|noscript|svg)[\s\S]*?<\/\1>/gi, "");
+  const t = (s.match(/<title>([\s\S]*?)<\/title>/i) || [])[1] || "";
+  s = s.replace(/<head[\s\S]*?<\/head>/i, "");
+  s = s.replace(/<h([1-6])[^>]*>([\s\S]*?)<\/h\1>/gi, (_, n, x) => `\n\n${"#".repeat(+n)} ${x}\n\n`);
+  s = s.replace(/<a [^>]*href="([^"]+)"[^>]*>([\s\S]*?)<\/a>/gi, (_, h, x) => `[${x}](${h})`);
+  s = s.replace(/<li[^>]*>/gi, "\n- ").replace(/<(p|div|section|article|tr|br)[^>]*>/gi, "\n");
+  s = s.replace(/<[^>]+>/g, "");
+  s = s.replace(/&amp;/g, "&").replace(/&lt;/g, "<").replace(/&gt;/g, ">").replace(/&quot;/g, '"').replace(/&#39;/g, "'").replace(/&nbsp;/g, " ");
+  s = s.split("\n").map((l) => l.trim()).join("\n").replace(/\n{3,}/g, "\n\n").trim();
+  return (t && !s.startsWith("# ") ? `# ${t.trim()}\n\n` : "") + s + "\n";
+}
+
+export default {
+  async fetch(req) {
+    const url = new URL(req.url);
+    const ORIGIN = url.origin;
+    const originUrl = req.url;
+    if (!wantsMarkdown(req) || req.method !== "GET") {
+      const r = await fetch(originUrl, { method: req.method, headers: req.headers, redirect: "manual" });
+      const out = new Response(r.body, r);
+      out.headers.append("Vary", "Accept");
+      return out;
+    }
+    if (url.pathname === "/" || url.pathname === "/index.html") {
+      const r = await fetch(ORIGIN + "/llms.txt");
+      if (r.ok) return md(await r.text());
+    }
+    const r = await fetch(originUrl, { redirect: "follow" });
+    if (r.status === 404) return md(NOT_FOUND_MD, 404);
+    const type = r.headers.get("Content-Type") || "";
+    if (!type.includes("text/html")) {
+      const out = new Response(r.body, r);
+      out.headers.append("Vary", "Accept");
+      return out;
+    }
+    return md(htmlToMarkdown(await r.text()), r.status);
+  },
+};

_cloudflare/wrangler.toml

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+name = "207studio-edge"
+main = "worker.js"
+compatibility_date = "2026-10-01"
+workers_dev = false
+routes = [
+  { pattern = "207studio.dev/*", zone_name = "207studio.dev" },
+]