Checks the ETag and sends a cache match response if it matches.

def check_cache(self, e_tag, match):
        """Checks the ETag and sends a cache match response if it matches."""
        if e_tag != match:
            return False
        self.send_response(304)
        self.send_header("ETag", e_tag)
        self.send_header("Cache-Control",
                         "max-age={0}".format(self.server.max_age))
        self.end_headers()
        thread_local.size = 0
        return True