Inspired from Github
If you have links, that might end with slashes (sometimes they are being added automatically), you won’t be able to handle them unless you add a string to your Yii2 project configuration.
Since version 2.0.10 UrlManager can be configured to handle trailing slashes in a simple way. Just make sure your config file has normalizer parameter:
'urlManager' => [ 'showScriptName' => false, 'enablePrettyUrl' => true, 'normalizer' => [ 'class' => 'yii\web\UrlNormalizer' ],
You’re done! Now you can use trailing slashes and everything will be routed correctly.