Current project (I’ve used Yii1 & 2 for several projects) is Angular IO in the front-end and Yii is mainly used to provide a REST API to Angular (plus some views that produce CSV or PDF downloads).
Some bots like to try and break in so they produce InvalidRouteException which goes into @runtime/logs/app
We monitor this log closely, as any PHP bug we put into our code will show up here. We like to fix bugs before the user reports them 
So I try to remove nuisance stuff from this log, keep it clean.
So I’m looking for a way to handle this exception and redirect to the application’s home page, preferably without modifying core Yii.
You can ignore exceptions. Here is a sample that you can adopt
[
'traceLevel' => 3,
'targets' => [
[
'class' => 'yii\log\EmailTarget',
'mailer' => 'mailer',
'levels' => ['error', 'warning'],
'message' => [
'from' => [...],
'to' => [...],
'subject' => '...' . date('d-m-Y'),
],
'except' => [
'yii\web\HttpException:404',
'yii\web\HttpException:401',
'yii\web\HttpException:403',
],
],
[
'class' => 'yii\log\FileTarget',
'levels' => ['error', 'warning'],
'except' => [
'yii\web\HttpException:404',
],
]
],
]
Thanks for hint, I was focussed on handling the exception but your idea is much better.
So far no luck.
I’ve tried
'except' => ['InvalidRouteException']
and
‘except’ = [‘InvalidRouteException:*’]
and
‘except’=[‘InvalidRouteException:404’]
but I’m still seeing this in the logs:
2022-07-01 16:51:44 [58.96.71.93][-][-][error][yii\web\HttpException:404] yii\base\InvalidRouteException: Unable to resolve the request "abc/abc". in /home/lamp/skilodge/release/master/release20220701_1/vendor/yiisoft/yii2/base/Module.php:561
Sorry for late reply. I missed your reply.
You are missing the namespace. Compare mine to yours
[
'class' => 'yii\log\FileTarget',
'levels' => ['error', 'warning'],
'except' => [
'yii\web\HttpException:404',
'yii\base\InvalidRouteException',
]
]
Thanks, I’ll try that. I should have looked more carefully!
Thanks for all the help, I found success with this code:
'except' => [
'yii\base\InvalidRouteException',
'yii\web\HttpException:404',
'yii\web\NotFoundHttpException',
]