fix(nuxt): do not redirect when `vue-router` normalises url (#20247)

packages/nuxt/src/pages/runtime/plugins/router.ts

@@ -8,7 +8,7 @@ import {
   createWebHistory
 } from 'vue-router'
 import { createError } from 'h3'
-import { isEqual, withoutBase } from 'ufo'
+import { withoutBase } from 'ufo'
 
 import type { PageMeta, Plugin, RouteMiddleware } from '../../../app/index'
 import { callWithNuxt, defineNuxtPlugin, useRuntimeConfig } from '#app/nuxt'
@@ -181,11 +181,8 @@ export default defineNuxtPlugin({
           fatal: false,
           statusMessage: `Page not found: ${to.fullPath}`
         })])
-      } else if (process.server) {
-        const currentURL = to.fullPath || '/'
-        if (!isEqual(currentURL, initialURL, { trailingSlash: true })) {
-          await callWithNuxt(nuxtApp, navigateTo, [currentURL])
-        }
+      } else if (process.server && to.redirectedFrom) {
+        await callWithNuxt(nuxtApp, navigateTo, [to.fullPath || '/'])
       }
     })
 

test/basic.test.ts

@@ -130,6 +130,11 @@ describe('pages', () => {
     await page.close()
   })
 
+  it('returns 500 when there is an infinite redirect', async () => {
+    const { status } = await fetch('/redirect-infinite', { redirect: 'manual' })
+    expect(status).toEqual(500)
+  })
+
   it('render 404', async () => {
     const html = await $fetch('/not-found')
 

test/fixtures/basic/middleware/redirect.global.ts

@@ -9,6 +9,10 @@ export default defineNuxtRouteMiddleware(async (to) => {
     await new Promise(resolve => setTimeout(resolve, 100))
     return navigateTo(to.path.slice('/redirect/'.length - 1))
   }
+  if (to.path === '/redirect-infinite') {
+    // the path will be the same in this new route and vue-router should send a 500 response
+    return navigateTo('/redirect-infinite?test=true')
+  }
   if (to.path === '/navigate-to-external') {
     return navigateTo('/', { external: true })
   }