Check header name for validity. Return True if name is valid

		:param header_name: name to check
		:return: bool

def header_name_check(header_name):
		""" Check header name for validity. Return True if name is valid

		:param header_name: name to check
		:return: bool
		"""
		header_match = WHTTPHeaders.header_name_re.match(header_name.encode('us-ascii'))
		return len(header_name) > 0 and header_match is not None