class Sinatra::Base

def self.force_encoding(data, encoding = default_encoding)
  return if data == settings || data.is_a?(Tempfile)
  if data.respond_to? :force_encoding
    data.force_encoding(encoding).encode!
  elsif data.respond_to? :each_value
    data.each_value { |v| force_encoding(v, encoding) }
  elsif data.respond_to? :each
    data.each { |v| force_encoding(v, encoding) }
  end
  data
end