AFAIK it will not be removed completely. In Rails 4, `match` without `:via` will be prohibited, so
``` ruby
match "/users/:user_id/webhooks/:agent_id/:secret" => \
  "webhooks#handle_request",
    :as => :webhooks
```
will be replaced with:

``` ruby
match "/users/:user_id/webhooks/:agent_id/:secret" => \
  "webhooks#handle_request",
    :as => :webhooks,
    :via => :all
```