module ActionDispatch::Http::Parameters

def path_parameters=(parameters) #:nodoc:
  delete_header('action_dispatch.request.parameters')
  # If any of the path parameters has an invalid encoding then
  # raise since it's likely to trigger errors further on.
  Request::Utils.check_param_encoding(parameters)
  set_header PARAMETERS_KEY, parameters
rescue Rack::Utils::ParameterTypeError, Rack::Utils::InvalidParameterError => e
  raise ActionController::BadRequest.new("Invalid path parameters: #{e.message}")
end