fix(nuxt): handle page rendering on different path (#21408)

packages/nuxt/src/app/nuxt.ts

@@ -119,6 +119,7 @@ interface _NuxtApp {
 
   ssrContext?: NuxtSSRContext
   payload: {
+    path?: string
     serverRendered?: boolean
     prerenderedAt?: number
     data: Record<string, any>
@@ -255,13 +256,13 @@ export function createNuxtApp (options: CreateOptions) {
   defineGetter(nuxtApp.vueApp.config.globalProperties, '$nuxt', nuxtApp)
 
   if (process.server) {
+    if (nuxtApp.ssrContext) {
       // Expose nuxt to the renderContext
-    if (nuxtApp.ssrContext) {
       nuxtApp.ssrContext.nuxt = nuxtApp
-    }
       // Expose payload types
-    if (nuxtApp.ssrContext) {
       nuxtApp.ssrContext._payloadReducers = {}
+      // Expose current path
+      nuxtApp.payload.path = nuxtApp.ssrContext.event.path
     }
     // Expose to server renderer to create payload
     nuxtApp.ssrContext = nuxtApp.ssrContext || {} as any

packages/nuxt/src/core/runtime/nitro/renderer.ts

@@ -122,6 +122,7 @@ const getSPARenderer = lazyCachedFunction(async () => {
   const renderToString = (ssrContext: NuxtSSRContext) => {
     const config = useRuntimeConfig()
     ssrContext!.payload = {
+      path: ssrContext.event.path,
       _errors: {},
       serverRendered: false,
       data: {},

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

@@ -27,7 +27,8 @@ import { globalMiddleware, namedMiddleware } from '#build/middleware'
 // https://github.com/vuejs/router/blob/4a0cc8b9c1e642cdf47cc007fa5bbebde70afc66/packages/router/src/history/html5.ts#L37
 function createCurrentLocation (
   base: string,
-  location: Location
+  location: Location,
+  renderedPath?: string
 ): string {
   const { pathname, search, hash } = location
   // allows hash bases like #, /#, #/, #!, #!/, /#!/, or even /folder#end
@@ -41,8 +42,8 @@ function createCurrentLocation (
     if (pathFromHash[0] !== '/') { pathFromHash = '/' + pathFromHash }
     return withoutBase(pathFromHash, '')
   }
-  const path = withoutBase(pathname, base)
+  const path = renderedPath || withoutBase(pathname, base)
-  return path + search + hash
+  return path + (path.includes('?') ? '' : search) + hash
 }
 
 const plugin: Plugin<{ router: Router }> = defineNuxtPlugin({
@@ -63,7 +64,10 @@ const plugin: Plugin<{ router: Router }> = defineNuxtPlugin({
     const routes = routerOptions.routes?.(_routes) ?? _routes
 
     let startPosition: Parameters<RouterScrollBehavior>[2] | null
-    const initialURL = process.server ? nuxtApp.ssrContext!.url : createCurrentLocation(routerBase, window.location)
+    const initialURL = process.server
+      ? nuxtApp.ssrContext!.url
+      : createCurrentLocation(routerBase, window.location, nuxtApp.payload.path)
+
     const router = createRouter({
       ...routerOptions,
       scrollBehavior: (to, from, savedPosition) => {

test/basic.test.ts

@@ -162,6 +162,15 @@ describe('pages', () => {
     await expectNoClientErrors('/not-found')
   })
 
+  it('should render correctly when loaded on a different path', async () => {
+    const page = await createPage('/proxy')
+
+    await page.waitForLoadState('networkidle')
+    expect(await page.innerText('body')).toContain('Composable | foo: auto imported from ~/composables/foo.ts')
+
+    await expectNoClientErrors('/proxy')
+  })
+
   it('preserves query', async () => {
     const html = await $fetch('/?test=true')
 

test/bundle.test.ts

@@ -45,7 +45,7 @@ describe.skipIf(isWindows || process.env.TEST_BUILDER === 'webpack' || process.e
 
   it('default server bundle size', async () => {
     stats.server = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
-    expect(roundToKilobytes(stats.server.totalBytes)).toMatchInlineSnapshot('"62.4k"')
+    expect(roundToKilobytes(stats.server.totalBytes)).toMatchInlineSnapshot('"62.5k"')
 
     const modules = await analyzeSizes('node_modules/**/*', serverDir)
     expect(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2284k"')

test/fixtures/basic/server/routes/proxy.ts

@@ -0,0 +1,3 @@
+export default defineEventHandler(async () => {
+  return await $fetch<string>('/')
+})