code: def header_name_check(header_name):
  		
  		header_match = WHTTPHeaders.header_name_re.match(header_name.encode('us-ascii'))
  		return len(header_name) > 0 and header_match is not None
docs: Check header name for validity. Return True if name is valid
  
  		:param header_name: name to check
  		:return: bool