fix: decode URI when previewing prerendered pages

.changeset/eleven-turkeys-jump.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: decode non-latin characters when previewing prerendered pages

packages/kit/src/exports/vite/preview/index.js

@@ -128,9 +128,14 @@ export async function preview(vite, vite_config, svelte_config) {
 
 				const { pathname, search } = new URL(/** @type {string} */ (req.url), 'http://dummy');
 
-				let filename = normalizePath(
-					join(svelte_config.kit.outDir, 'output/prerendered/pages' + pathname)
-				);
+				let filename = normalizePath(join(svelte_config.kit.outDir, 'output/prerendered/pages' + pathname));
+
+				try {
+					filename = decodeURI(filename)
+				} catch {
+					// malformed URI
+				}
+
 				let prerendered = is_file(filename);
 
 				if (!prerendered) {

packages/kit/test/apps/basics/src/routes/prerendering/中文/+page.ts

@@ -0,0 +1 @@
+export const prerender = true;

packages/kit/test/apps/basics/test/server.test.js

@@ -630,6 +630,11 @@ test.describe('Miscellaneous', () => {
 		expect(response.status()).toBe(200);
 		expect(await response.text()).toBe('foo');
 	});
+
+	test('serves prerendered non-latin pages', async ({ request }) => {
+		const response = await request.get('/prerendering/中文');
+		expect(response.status()).toBe(200);
+	});
 });
 
 test.describe('reroute', () => {