fix: absolute redirect to /invite-only (relative one was a 500 in production)

src/lib/site-offline.test.ts

@@ -15,7 +15,8 @@ describe('bittorrented.com offline, invite only', () => {
     for (const path of ['/', '/search?q=x', '/dht', '/torrents/abc', '/pricing', '/account']) {
       const res = await get(path);
       expect(res.status).toBe(307);
-      expect(res.headers.get('location')).toMatch(/\/invite-only$/);
+      // Absolute, or Next.js answers 500 "Invalid URL" in production.
+      expect(res.headers.get('location')).toBe('https://bittorrented.com/invite-only');
     }
   });
 

src/lib/site-offline.ts

@@ -38,13 +38,15 @@ export function openWhileInviteOnly(pathname: string): boolean {
  * Pages go to the invite-only screen; the API answers 503 so clients and search
  * engines treat it as temporary.
  */
-export function offlineResponse(pathname: string): Response {
+export function offlineResponse(pathname: string, requestUrl: string | URL): Response {
   const headers = { 'cache-control': 'no-store' };
   if (pathname.startsWith('/api/')) {
     return Response.json(
       { error: 'BitTorrented is invite only and not open yet.' },
       { status: 503, headers: { ...headers, 'retry-after': '86400' } }
     );
   }
-  return new Response(null, { status: 307, headers: { ...headers, location: INVITE_ONLY_PAGE } });
+  // Absolute: Next.js answers 500 "Invalid URL" for a relative Location from the proxy.
+  const location = new URL(INVITE_ONLY_PAGE, requestUrl).toString();
+  return new Response(null, { status: 307, headers: { ...headers, location } });
 }

src/proxy.ts

@@ -556,7 +556,7 @@ export async function proxy(request: NextRequest): Promise<Response> {
     !openWhileInviteOnly(request.nextUrl.pathname) &&
     !(await isAdmin())
   ) {
-    return asNext(offlineResponse(request.nextUrl.pathname));
+    return asNext(offlineResponse(request.nextUrl.pathname, request.url));
   }
 
   // --- 0b. Legal mode: only reviewed features are served (see src/lib/legal-mode.ts) ---