fix: retain URL query string for trailing slash redirects to prerendered pages

.changeset/gold-meals-listen.md

@@ -0,0 +1,7 @@
+---
+'@sveltejs/adapter-cloudflare-workers': patch
+'@sveltejs/adapter-cloudflare': patch
+'@sveltejs/kit': patch
+---
+
+fix: retain URL query string for trailing slash redirects to prerendered pages

packages/adapter-cloudflare-workers/files/entry.js

@@ -40,7 +40,7 @@ export default {
 			});
 		}
 
-		let { pathname } = url;
+		let { pathname, search } = url;
 		try {
 			pathname = decodeURIComponent(pathname);
 		} catch {
@@ -57,7 +57,7 @@ export default {
 				manifest.assets.has(filename) || manifest.assets.has(filename + '/index.html');
 		}
 
-		const location = pathname.at(-1) === '/' ? stripped_pathname : pathname + '/';
+		let location = pathname.at(-1) === '/' ? stripped_pathname : pathname + '/';
 
 		if (is_static_asset || prerendered.has(pathname)) {
 			return get_asset_from_kv(req, env, context, (request, options) => {
@@ -69,6 +69,7 @@ export default {
 				return mapRequestToAsset(request, options);
 			});
 		} else if (location && prerendered.has(location)) {
+			if (search) location += search;
 			return new Response('', {
 				status: 308,
 				headers: {

packages/adapter-cloudflare/src/worker.js

@@ -14,7 +14,7 @@ const worker = {
 		let res = !pragma.includes('no-cache') && (await Cache.lookup(req));
 		if (res) return res;
 
-		let { pathname } = new URL(req.url);
+		let { pathname, search } = new URL(req.url);
 		try {
 			pathname = decodeURIComponent(pathname);
 		} catch {
@@ -31,11 +31,12 @@ const worker = {
 				manifest.assets.has(filename) || manifest.assets.has(filename + '/index.html');
 		}
 
-		const location = pathname.at(-1) === '/' ? stripped_pathname : pathname + '/';
+		let location = pathname.at(-1) === '/' ? stripped_pathname : pathname + '/';
 
 		if (is_static_asset || prerendered.has(pathname)) {
 			res = await env.ASSETS.fetch(req);
 		} else if (location && prerendered.has(location)) {
+			if (search) location += search;
 			res = new Response('', {
 				status: 308,
 				headers: {

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

@@ -102,7 +102,7 @@ export async function preview(vite, vite_config, svelte_config) {
 					return;
 				}
 
-				const { pathname } = new URL(/** @type {string} */ (req.url), 'http://dummy');
+				const { pathname, search } = new URL(/** @type {string} */ (req.url), 'http://dummy');
 
 				let filename = normalizePath(
 					join(svelte_config.kit.outDir, 'output/prerendered/pages' + pathname)
@@ -113,6 +113,7 @@ export async function preview(vite, vite_config, svelte_config) {
 					const has_trailing_slash = pathname.endsWith('/');
 					const html_filename = `${filename}${has_trailing_slash ? 'index.html' : '.html'}`;
 
+					/** @type {string | undefined} */
 					let redirect;
 
 					if (is_file(html_filename)) {
@@ -127,6 +128,7 @@ export async function preview(vite, vite_config, svelte_config) {
 					}
 
 					if (redirect) {
+						if (search) redirect += search;
 						res.writeHead(307, {
 							location: redirect
 						});

packages/kit/test/apps/basics/src/routes/routing/prerendered/+layout.js

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

packages/kit/test/apps/basics/src/routes/routing/prerendered/trailing-slash/always/+page.js

@@ -0,0 +1 @@
+export const trailingSlash = 'always';

packages/kit/test/apps/basics/src/routes/routing/prerendered/trailing-slash/ignore/+page.js

@@ -0,0 +1 @@
+export const trailingSlash = 'ignore';

packages/kit/test/apps/basics/svelte.config.js

@@ -2,6 +2,12 @@
 const config = {
 	kit: {
 		prerender: {
+			entries: [
+				'*',
+				'/routing/prerendered/trailing-slash/always/',
+				'/routing/prerendered/trailing-slash/never',
+				'/routing/prerendered/trailing-slash/ignore'
+			],
 			handleHttpError: 'warn'
 		},
 

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

@@ -502,6 +502,21 @@ test.describe('Routing', () => {
 		const data = await response.json();
 		expect(data).toEqual({ surprise: 'lol' });
 	});
+
+	test('Vite trailing slash redirect for prerendered pages retains URL query string', async ({
+		request
+	}) => {
+		if (process.env.DEV) return;
+
+		let response = await request.get('/routing/prerendered/trailing-slash/always?a=1');
+		expect(new URL(response.url()).search).toBe('?a=1');
+
+		response = await request.get('/routing/prerendered/trailing-slash/never/?a=1');
+		expect(new URL(response.url()).search).toBe('?a=1');
+
+		response = await request.get('/routing/prerendered/trailing-slash/ignore/?a=1');
+		expect(new URL(response.url()).search).toBe('?a=1');
+	});
 });
 
 test.describe('Shadowed pages', () => {