[Rails] Route mapping?

Hi,
I am very new to Ruby on Rails. I am going through some books as
reference. When I was running my app I mistaken place a letter like:
localhost:3000/s and as there was no matching for s in my route.rb I
get this error:
Routing Error

No route matches "/s" with {:method=>:get}

So, my question is that; is there any way or exception to handle such condition?

Any idea regarding this?

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