vweb: fix catchall route (#11168)

vlib/vweb/route_test.v

@@ -268,3 +268,15 @@ fn test_route_params_array() {
 		route: '/:a/:b/:c...'
 	}.test_param(['one', 'two', 'three/d/e'])
 }
+
+fn test_route_index_path() {
+	RoutePair{
+		url: '/'
+		route: '/:path...'
+	}.test_param(['/'])
+
+	RoutePair{
+		url: '/foo/bar'
+		route: '/:path...'
+	}.test_param(['/foo/bar'])
+}

vlib/vweb/vweb.v

@@ -441,6 +441,10 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 
 fn route_matches(url_words []string, route_words []string) ?[]string {
 	// URL path should be at least as long as the route path
+	// except for the catchall route (`/:path...`)
+	if route_words.len == 1 && route_words[0].starts_with(':') && route_words[0].ends_with('...') {
+		return ['/' + url_words.join('/')]
+	}
 	if url_words.len < route_words.len {
 		return none
 	}