code: def create_response(version, status, headers):
      
      message = []
      message.append('HTTP/{} {}\r\n'.format(version, status))
      for name, value in headers:
          message.append(name)
          message.append(': ')
          message.append(value)
          message.append('\r\n')
      message.append('\r\n')
      return s2b(''.join(message))
docs: Create a HTTP response header.