Method _get_cached_version

python/python3/tornado/web.py:3018–3030

(cls, abs_path: str)

    @classmethod
    def _get_cached_version(cls, abs_path: str) -> Optional[str]:
        with cls._lock:
            hashes = cls._static_hashes
            if abs_path not in hashes:
                try:
                    hashes[abs_path] = cls.get_content_version(abs_path)
                except Exception:
                    gen_log.error("Could not open static file %r", abs_path)
                    hashes[abs_path] = None
            hsh = hashes.get(abs_path)
            if hsh:
                return hsh
        return None


class FallbackHandler(RequestHandler):