account for search params

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

@@ -71,13 +71,15 @@ export async function preview(vite, vite_config, svelte_config) {
 
 		vite.middlewares.use((req, res, next) => {
 			const original_url = /** @type {string} */ (req.url);
-			const { pathname } = new URL(original_url, 'http://dummy');
+			const { pathname, search } = new URL(original_url, 'http://dummy');
 
 			// if `paths.base === '/a/b/c`, then the root route is `/a/b/c/`,
 			// regardless of the `trailingSlash` route option
 			if (base.length > 1 && pathname === base) {
+				let location = base + '/';
+				if (search) location += search;
 				res.writeHead(307, {
-					location: base + '/'
+					location
 				});
 				res.end();
 				return;