vweb: route to index dynamically (#7782)

vlib/vweb/tests/vweb_test.v

@@ -60,7 +60,7 @@ fn assert_common_headers(received string) {
 }
 
 fn test_a_simple_tcp_client_can_connect_to_the_vweb_server() {
-	received := simple_tcp_client({}) or {
+	received := simple_tcp_client(path: '/') or {
 		assert err == ''
 		return
 	}

vlib/vweb/tests/vweb_test_server.v

@@ -44,13 +44,12 @@ pub fn (mut app App) init_once() {
 	eprintln('>> webserver: started on http://127.0.0.1:$app.port/ , with maximum runtime of $app.timeout milliseconds.')
 }
 
-pub fn (mut app App) index() {
-	app.text('Welcome to VWeb')
+pub fn (mut app App) index() vweb.Result {
+	return app.text('Welcome to VWeb')
 }
 
 pub fn (mut app App) simple() vweb.Result {
-	app.text('A simple result')
-	return vweb.Result{}
+	return app.text('A simple result')
 }
 
 pub fn (mut app App) html_page() vweb.Result {

vlib/vweb/vweb.v

@@ -367,12 +367,8 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 	// mut url_words := vals[1][1..].split('/').filter(it != '')
 	x := vals[1][1..].split('/')
 	mut url_words := x.filter(it != '')
-	if url_words.len == 0 {
-		app.index()
-		return
-	} else {
 	// Parse URL query
-		if url_words.last().contains('?') {
+	if url_words.len > 0 && url_words.last().contains('?') {
 		words := url_words.last().after('?').split('&')
 		tmp_query := words.map(it.split('='))
 		url_words[url_words.len - 1] = url_words.last().all_before('?')
@@ -382,7 +378,6 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 			}
 		}
 	}
-	}
 	mut vars := []string{cap: route_words_a.len}
 	mut action := ''
 	$for method in T.methods {
@@ -420,6 +415,7 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 				route_words_a = attrs.filter(it.to_lower() != 'get').map(it[1..].split('/'))
 			}
 			if attrs.len == 0 || (attrs.len == 1 && route_words_a.len == 0) {
+				if url_words.len > 0 {
 					// No routing for this method. If it matches, call it and finish matching
 					// since such methods have a priority.
 					// For example URL `/register` matches route `/:user`, but `fn register()`
@@ -433,11 +429,21 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 						app.$method(vars)
 						return
 					}
+				} else if method.name == 'index' {
+					// handle / to .index()
+					$if debug {
+						println('route to .index()')
+					}
+					app.$method(vars)
+					return
+				}
 			} else {
 				mut req_method := []string{}
 				if route_words_a.len > 0 {
-					for route_words in route_words_a {
-						if route_words[0] in methods_without_first && route_words.len == 1 {
+					for route_words_ in route_words_a {
+						// cannot move to line initialize line because of C error with map(it.filter(it != ''))
+						route_words := route_words_.filter(it != '')
+						if route_words.len == 1 && route_words[0] in methods_without_first {
 							req_method << route_words[0]
 						}
 						if url_words.len == route_words.len ||
@@ -451,6 +457,10 @@ fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
 							mut matching := false
 							mut unknown := false
 							mut variables := []string{cap: route_words.len}
+							if route_words.len == 0 && url_words.len == 0 {
+								// index route
+								matching = true
+							}
 							for i in 0 .. route_words.len {
 								if url_words.len == i {
 									variables << ''