code: def format_header_param(name, value):
      
      if not any(ch in value for ch in '"\\\r\n'):
          result = '%s="%s"' % (name, value)
          try:
              result.encode('ascii')
          except (UnicodeEncodeError, UnicodeDecodeError):
              pass
          else:
              return result
      if not six.PY3 and isinstance(value, six.text_type):  # Python 2:
          value = value.encode('utf-8')
      value = email.utils.encode_rfc2231(value, 'utf-8')
      value = '%s*=%s' % (name, value)
      return value
docs: Helper function to format and quote a single header parameter.
  
      Particularly useful for header parameters which might contain
      non-ASCII values, like file names. This follows RFC 2231, as
      suggested by RFC 2388 Section 4.4.
  
      :param name:
          The name of the parameter, a string expected to be ASCII only.
      :param value:
          The value of the parameter, provided as a unicode string.