Escapes &, “, > and < in string
 
               # File webrick/htmlutils.rb, line 18
def escape(string)
  return "" unless string
  str = string.b
  str.gsub!(/&/n, '&')
  str.gsub!(/\"/n, '"')
  str.gsub!(/>/n, '>')
  str.gsub!(/</n, '<')
  str.force_encoding(string.encoding)
end