Dynamic robots.txt so only www gets indexed

src/app/robots.txt/route.ts

@@ -0,0 +1,26 @@
+export async function GET(request: Request) {
+
+    let robotsTxt = `#
+# robots.txt - not running on www yet, so don't index anything
+#
+User-agent: *
+Disallow: /
+`;
+
+    if (request.headers.get("Host") === "www.regexplanet.com") {
+        robotsTxt = `#
+# almost empty: everything at RegexPlanet is indexable!
+#
+Sitemap: https://www.regexplanet.com/sitemap.xml
+
+User-agent: *
+Disallow: /honeypot.txt
+`
+    }
+
+    return new Response(robotsTxt, {
+      headers: {
+        "Content-Type": "text/plain; charset=utf-8",
+      },
+    });
+}