code: def _should_sign_request_header(header_name):
      
  
      if header_name in {_HEADER_USER_AGENT, _HEADER_CACHE_CONTROL}:
          return True
  
      if re.match(_PATTERN_HEADER_PREFIX_BUNQ, header_name):
          return True
  
      return False
docs: :type header_name: str
  
      :rtype: bool