vweb: add host option to controller (#18303)

vlib/vweb/tests/controller_test.v

@@ -137,9 +137,9 @@ fn test_duplicate_route() {
 	$if windows {
 		task := spawn os.execute(server_exec_cmd)
 		res := task.wait()
-		assert res.output.contains('V panic: method "duplicate" with route "/admin/duplicate" should be handled by the Controller of "/admin"')
+		assert res.output.contains('V panic: conflicting paths')
 	} $else {
 		res := os.execute(server_exec_cmd)
-		assert res.output.contains('V panic: method "duplicate" with route "/admin/duplicate" should be handled by the Controller of "/admin"')
+		assert res.output.contains('V panic: conflicting paths')
 	}
 }

vlib/vweb/tests/vweb_test.v

@@ -238,6 +238,20 @@ fn test_http_client_multipart_form_data() {
 	assert x.body == files[0].data
 }
 
+fn test_host() {
+	mut req := http.Request{
+		url: 'http://${localserver}/with_host'
+		method: .get
+	}
+
+	mut x := req.do()!
+	assert x.status() == .not_found
+
+	req.add_header(.host, 'example.com')
+	x = req.do()!
+	assert x.status() == .ok
+}
+
 fn test_http_client_shutdown_does_not_work_without_a_cookie() {
 	x := http.get('http://${localserver}/shutdown') or {
 		assert err.msg() == ''

vlib/vweb/tests/vweb_test_server.v

@@ -119,6 +119,12 @@ pub fn (mut app App) not_found() vweb.Result {
 	return app.html('404 on "${app.req.url}"')
 }
 
+[host: 'example.com']
+['/with_host']
+pub fn (mut app App) with_host() vweb.Result {
+	return app.ok('')
+}
+
 pub fn (mut app App) shutdown() vweb.Result {
 	session_key := app.get_cookie('skey') or { return app.not_found() }
 	if session_key != 'superman' {