Fix rsc payload fetch failures due to state tree encoding

packages/next/src/client/components/router-reducer/fetch-server-response.ts

@@ -37,7 +37,9 @@ export async function fetchServerResponse(
     // Enable flight response
     [RSC]: '1',
     // Provide the current router state
-    [NEXT_ROUTER_STATE_TREE]: JSON.stringify(flightRouterState),
+    [NEXT_ROUTER_STATE_TREE]: encodeURIComponent(
+      JSON.stringify(flightRouterState)
+    ),
   }
 
   /**

packages/next/src/server/app-render/parse-and-validate-flight-router-state.tsx

@@ -23,7 +23,9 @@ export function parseAndValidateFlightRouterState(
   }
 
   try {
-    return flightRouterStateSchema.parse(JSON.parse(stateHeader))
+    return flightRouterStateSchema.parse(
+      JSON.parse(decodeURIComponent(stateHeader))
+    )
   } catch {
     throw new Error('The router state header was sent but could not be parsed.')
   }

test/e2e/app-dir/navigation/app/search-params/page.js

@@ -0,0 +1,12 @@
+import Link from 'next/link'
+
+export default function page({ searchParams }) {
+  return (
+    <div>
+      <p id="name">{searchParams.name ?? ''}</p>
+      <Link id="link" href="/">
+        home
+      </Link>
+    </div>
+  )
+}

test/e2e/app-dir/navigation/navigation.test.ts

@@ -1,6 +1,6 @@
 import { createNextDescribe } from 'e2e-utils'
-import webdriver from 'next-webdriver'
 import { check } from 'next-test-utils'
+import type { Request } from 'playwright-chromium'
 
 createNextDescribe(
   'app dir - navigation',
@@ -10,7 +10,7 @@ createNextDescribe(
   ({ next, isNextDev, isNextDeploy }) => {
     describe('query string', () => {
       it('should set query correctly', async () => {
-        const browser = await webdriver(next.url, '/')
+        const browser = await next.browser('/')
         expect(await browser.elementById('query').text()).toMatchInlineSnapshot(
           `""`
         )
@@ -25,6 +25,35 @@ createNextDescribe(
         const url = new URL(await browser.url())
         expect(url.searchParams.toString()).toMatchInlineSnapshot(`"a=b&c=d"`)
       })
+
+      it('should handle unicode search params', async () => {
+        const requests = []
+
+        const browser = await next.browser('/search-params?name=名')
+        browser.on('request', async (req: Request) => {
+          const res = await req.response()
+          requests.push([
+            new URL(req.url()).pathname,
+            res.ok(),
+            await res.headers(),
+          ])
+        })
+        expect(await browser.elementById('name').text()).toBe('名')
+        await browser.elementById('link').click()
+
+        await check(async () => {
+          return requests.some((requestPair) => {
+            const [pathname, ok, headers] = requestPair
+            return (
+              pathname === '/' &&
+              ok &&
+              headers['content-type'] === 'text/x-component'
+            )
+          })
+            ? 'success'
+            : JSON.stringify(requests)
+        }, 'success')
+      })
     })
 
     describe('hash', () => {