class ActionDispatch::Journey::Router::Utils

def self.unescape_uri(uri)

unescape_uri(uri) #=> "/topics?title=Ruby on Rails"
uri = "/topics?title=Ruby%20on%20Rails"

Replaces any escaped sequences with their unescaped representations. 
def self.unescape_uri(uri)
  ENCODER.unescape_uri(uri)
end