Answer 410 to spam URLs with paths in the query string

src/proxy.ts

@@ -4,9 +4,18 @@ import { defaultLocale, isLocale } from "@/i18n/config";
 // Every page lives under app/[lang]. English keeps its unprefixed URLs, so those requests are
 // rewritten to /en internally, and /en/... is redirected back to the unprefixed address.
 export function proxy(request: NextRequest) {
-  const { pathname } = request.nextUrl;
+  const { pathname, searchParams } = request.nextUrl;
   const first = pathname.split("/")[1];
 
+  // Spam sites link here with made-up paths in the query string (/?shop/items/L738.../).
+  // Answer 410 so search engines drop them instead of indexing copies of the page.
+  if ([...searchParams.keys()].some((key) => key.includes("/"))) {
+    return new NextResponse("Gone", {
+      status: 410,
+      headers: { "content-type": "text/plain; charset=utf-8", "x-robots-tag": "noindex" },
+    });
+  }
+
   if (first === defaultLocale) {
     const url = request.nextUrl.clone();
     url.pathname = pathname.slice(defaultLocale.length + 1) || "/";