"""
Compatibility Support for Python 2.7 and earlier
"""

import sys


def get_all_headers(message, key):
    """
    Given an HTTPMessage, return all headers matching a given key.
    """
    return message.get_all(key)


if sys.version_info < (3,):
    def get_all_headers(message, key):
        return message.getheaders(key)