fix encoding error with location and refresh headers

packages/next/server/next-server.ts

@@ -934,13 +934,25 @@ export default class Server {
     // we need to re-encode them here but still allow passing through
     // values from rewrites/redirects
     const stringifyQuery = (req: IncomingMessage, query: ParsedUrlQuery) => {
-      const initialQueryValues = Object.values((req as any).__NEXT_INIT_QUERY)
+      const initialQuery = (req as any).__NEXT_INIT_QUERY
+      const initialQueryValues: Array<string | string[]> =
+        Object.values(initialQuery)
 
       return stringifyQs(query, undefined, undefined, {
         encodeURIComponent(value) {
-          if (initialQueryValues.some((val) => val === value)) {
+          const queryContainsValue = (queryVal: string | string[]) =>
+            Array.isArray(queryVal)
+              ? queryVal.includes(value)
+              : queryVal === value
+
+          if (
+            value in initialQuery ||
+            initialQueryValues.some(queryContainsValue)
+          ) {
+            // Encode keys and values from initial query
             return encodeURIComponent(value)
           }
+
           return value
         },
       })

test/integration/custom-routes/test/index.test.js

@@ -690,6 +690,26 @@ const runTests = (isDev = false) => {
     expect(res.headers.get('refresh')).toBe(`0;url=/`)
   })
 
+  it('should have correctly encoded query in location and refresh headers', async () => {
+    const res = await fetchViaHTTP(
+      appPort,
+      // Query unencoded is ?テスト=あ
+      '/redirect4?%E3%83%86%E3%82%B9%E3%83%88=%E3%81%82',
+      undefined,
+      {
+        redirect: 'manual',
+      }
+    )
+    expect(res.status).toBe(308)
+
+    expect(res.headers.get('location').split('?')[1]).toBe(
+      '%E3%83%86%E3%82%B9%E3%83%88=%E3%81%82'
+    )
+    expect(res.headers.get('refresh')).toBe(
+      '0;url=/?%E3%83%86%E3%82%B9%E3%83%88=%E3%81%82'
+    )
+  })
+
   it('should handle basic api rewrite successfully', async () => {
     const data = await renderViaHTTP(appPort, '/api-hello')
     expect(JSON.parse(data)).toEqual({ query: {} })