From 3f994d4e143c027ccdb3b8291f500070d586d433 Mon Sep 17 00:00:00 2001
From: Max Ghenis <mghenis@gmail.com>
Date: Mon, 6 Jul 2026 14:20:50 -0400
Subject: [PATCH] Re-land /policybench vanity redirect on app-v2
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The /policybench and /:countryId/policybench vanity redirects to
policybench.org were added to policyengine-app (v1) in #2842 after v2
took over serving policyengine.org (domain shift, 2026-03-30), so they
never went live — both paths 404 on production today.

Re-land them on the Next.js website host:
- website/next.config.ts redirects() — the authoritative layer (this is
  where /pe84 resolves on prod, verified via 308 → /us/pe84).
- vercel.json (root) — mirror, matching how /pe84 exists in both layers.
- Cover both entries in website/src/__tests__/config/next-config.test.ts.

External destination and permanent: false (307), matching the /pe84 root
vercel.json entry — avoids browsers hard-caching a cross-domain jump if
the vanity target ever moves.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 changelog_entry.yaml                          |  1 +
 vercel.json                                   | 10 +++++++
 website/next.config.ts                        | 13 ++++++++
 .../src/__tests__/config/next-config.test.ts  | 30 +++++++++++++++++++
 4 files changed, 54 insertions(+)

diff --git a/changelog_entry.yaml b/changelog_entry.yaml
index eaceeef42..805a8fe31 100644
--- a/changelog_entry.yaml
+++ b/changelog_entry.yaml
@@ -5,6 +5,7 @@
       - Add the Introducing PolicyBench research post
       - Add UK Universal Credit rebalancing analysis dashboard at /uk/uc-rebalancing
       - Add UK fuel duty rise cancellation analysis dashboard at /uk/cancelling-fuel-duty-rise
+      - Redirect the /policybench and /:countryId/policybench vanity paths to policybench.org
     changed:
       - Proxy UK Python package docs at /uk/python and UK API docs at /uk/api so the country-parameterized "Python" and "API" nav links work on UK pages
       - Align the calculator app header (e.g. /us/reports) with the main website header — hover-open dropdowns, per-item underline, Model dropdown with sub-items, Python link, and Events under About
diff --git a/vercel.json b/vercel.json
index e8677a0cf..ff31225c0 100644
--- a/vercel.json
+++ b/vercel.json
@@ -23,6 +23,16 @@
       "source": "/pe84",
       "destination": "/us/pe84",
       "permanent": false
+    },
+    {
+      "source": "/policybench",
+      "destination": "https://policybench.org",
+      "permanent": false
+    },
+    {
+      "source": "/:countryId/policybench",
+      "destination": "https://policybench.org",
+      "permanent": false
     }
   ],
   "rewrites": [
diff --git a/website/next.config.ts b/website/next.config.ts
index 9ed6f4c55..5ff5d67f2 100644
--- a/website/next.config.ts
+++ b/website/next.config.ts
@@ -84,6 +84,19 @@ const nextConfig: NextConfig = {
         destination: "/us/pe84",
         permanent: true,
       },
+      // Vanity redirects to the standalone PolicyBench site (external).
+      // policybench.org is country-agnostic, so both the bare and
+      // country-prefixed paths land on its root.
+      {
+        source: "/policybench",
+        destination: "https://policybench.org",
+        permanent: false,
+      },
+      {
+        source: "/:countryId/policybench",
+        destination: "https://policybench.org",
+        permanent: false,
+      },
       {
         source: "/uk/ads-dashboard",
         destination: "/us/ads-dashboard",
diff --git a/website/src/__tests__/config/next-config.test.ts b/website/src/__tests__/config/next-config.test.ts
index 0bcc100df..389ec77d3 100644
--- a/website/src/__tests__/config/next-config.test.ts
+++ b/website/src/__tests__/config/next-config.test.ts
@@ -53,6 +53,14 @@ async function getBeforeFileRewrites() {
   return rewrites.beforeFiles ?? [];
 }
 
+async function getRedirects() {
+  if (!nextConfig.redirects) {
+    throw new Error("Expected Next config to define redirects.");
+  }
+
+  return nextConfig.redirects();
+}
+
 describe("nextConfig rewrites", () => {
   test("serves PolicyEngine icon fallbacks before app-zone proxies", async () => {
     const beforeFiles = await getBeforeFileRewrites();
@@ -68,3 +76,25 @@ describe("nextConfig rewrites", () => {
     ).toBeGreaterThan(expectedPolicyEngineIconRewrites.length - 1);
   });
 });
+
+describe("nextConfig redirects", () => {
+  test("redirects the bare /policybench vanity path to policybench.org", async () => {
+    const redirects = await getRedirects();
+
+    expect(redirects).toContainEqual({
+      source: "/policybench",
+      destination: "https://policybench.org",
+      permanent: false,
+    });
+  });
+
+  test("redirects the country-prefixed /policybench vanity path to policybench.org", async () => {
+    const redirects = await getRedirects();
+
+    expect(redirects).toContainEqual({
+      source: "/:countryId/policybench",
+      destination: "https://policybench.org",
+      permanent: false,
+    });
+  });
+});