class DebugHeaders(object):

    # List of headers we want to display
    header_filter = (
        'CONTENT_TYPE',
        'HTTP_ACCEPT',
        'HTTP_ACCEPT_CHARSET',
        'HTTP_ACCEPT_ENCODING',
        'HTTP_ACCEPT_LANGUAGE',
        'HTTP_CACHE_CONTROL',
        'HTTP_CONNECTION',
        'HTTP_HOST',
        'HTTP_KEEP_ALIVE',
        'HTTP_REFERER',
        'HTTP_USER_AGENT',
        'QUERY_STRING',
        'REMOTE_ADDR',
        'REMOTE_HOST',
        'REQUEST_METHOD',
        'SCRIPT_NAME',
        'SERVER_NAME',
        'SERVER_PORT',
        'SERVER_PROTOCOL',
        'SERVER_SOFTWARE',
    )

    def available_headers(self, request):
        return dict(
            [(k, request.META[k]) for k in self.header_filter if k in request.META]
        )