Setting max-age on the response causes cachecontrol to fail with exception about 'expires' argument

Commencez dans cachecontrol/controller.py, au niveau de CacheController.cache_response, en suivant le chemin max-age indiqué dans le traceback et en comparant l’appel à cache.set avec l’implémentation du cache. Reproduisez l’échec avec une réponse contenant Cache-Control: public, max-age=1, puis ajoutez une couverture pour que la réponse soit mise en cache sans le expires TypeError.

Applies to cachecontrol 0.12.7 and probably 0.12.8

When we have a response with following header: 'Cache-Control': 'public, max-age=1'

I believe this may be related to this PR: https://github.com/ionrock/cachecontrol/pull/233

We get the following exception from cachecontrol:

TypeError: set() got an unexpected keyword argument 'expires'
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/local/lib/python3.9/site-packages/requests/sessions.py:555: in get
    return self.request('GET', url, **kwargs)
/usr/local/lib/python3.9/site-packages/requests/sessions.py:542: in request
    resp = self.send(prep, **send_kwargs)
/usr/local/lib/python3.9/site-packages/requests/sessions.py:697: in send
    r.content
/usr/local/lib/python3.9/site-packages/requests/models.py:836: in content
    self._content = b''.join(self.iter_content(CONTENT_CHUNK_SIZE)) or b''
/usr/local/lib/python3.9/site-packages/requests/models.py:758: in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
/usr/local/lib/python3.9/site-packages/urllib3/response.py:576: in stream
    data = self.read(amt=amt, decode_content=decode_content)
/usr/local/lib/python3.9/site-packages/urllib3/response.py:519: in read
    data = self._fp.read(amt) if not fp_closed else b""
/usr/local/lib/python3.9/site-packages/cachecontrol/filewrapper.py:96: in read
    self._close()
/usr/local/lib/python3.9/site-packages/cachecontrol/filewrapper.py:76: in _close
    self.__callback(result)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
self = <cachecontrol.controller.CacheController object at 0x7f30ba331640>
request = <PreparedRequest [GET]>
response = <urllib3.response.HTTPResponse object at 0x7f30ba3179a0>, body = b''
status_codes = None
    def cache_response(self, request, response, body=None, status_codes=None):
        """
        Algorithm for caching requests.
    
        This assumes a requests Response object.
        """
        # From httplib2: Don't cache 206's since we aren't going to
        #                handle byte range requests
        cacheable_status_codes = status_codes or self.cacheable_status_codes
        if response.status not in cacheable_status_codes:
            logger.debug(
                "Status code %s not in %s", response.status, cacheable_status_codes
            )
            return
    
        response_headers = CaseInsensitiveDict(response.headers)
    
        if 'date' in response_headers:
            date = calendar.timegm(
                parsedate_tz(response_headers['date'])
            )
        else:
            date = 0
    
        # If we've been given a body, our response has a Content-Length, that
        # Content-Length is valid then we can check to see if the body we've
        # been given matches the expected size, and if it doesn't we'll just
        # skip trying to cache it.
        if (
            body is not None
            and "content-length" in response_headers
            and response_headers["content-length"].isdigit()
            and int(response_headers["content-length"]) != len(body)
        ):
            return
    
        cc_req = self.parse_cache_control(request.headers)
        cc = self.parse_cache_control(response_headers)
    
        cache_url = self.cache_url(request.url)
        logger.debug('Updating cache with response from "%s"', cache_url)
    
        # Delete it from the cache if we happen to have it stored there
        no_store = False
        if "no-store" in cc:
            no_store = True
            logger.debug('Response header has "no-store"')
        if "no-store" in cc_req:
            no_store = True
            logger.debug('Request header has "no-store"')
        if no_store and self.cache.get(cache_url):
            logger.debug('Purging existing cache entry to honor "no-store"')
            self.cache.delete(cache_url)
        if no_store:
            return
    
        # https://tools.ietf.org/html/rfc7234#section-4.1:
        # A Vary header field-value of "*" always fails to match.
        # Storing such a response leads to a deserialization warning
        # during cache lookup and is not allowed to ever be served,
        # so storing it can be avoided.
        if "*" in response_headers.get("vary", ""):
            logger.debug('Response header has "Vary: *"')
            return
    
        # If we've been given an etag, then keep the response
        if self.cache_etags and "etag" in response_headers:
            expires_time = 0
            if response_headers.get('expires'):
                expires = parsedate_tz(response_headers['expires'])
                if expires is not None:
                    expires_time = calendar.timegm(expires) - date
    
            expires_time = max(expires_time, 14 * 86400)
    
            logger.debug('etag object cached for {0} seconds'.format(expires_time))
            logger.debug("Caching due to etag")
            self.cache.set(
                cache_url,
                self.serializer.dumps(request, response, body),
                expires=expires_time
            )
    
        # Add to the cache any permanent redirects. We do this before looking
        # that the Date headers.
        elif int(response.status) in PERMANENT_REDIRECT_STATUSES:
            logger.debug("Caching permanent redirect")
            self.cache.set(cache_url, self.serializer.dumps(request, response, b''))
    
        # Add to the cache if the response headers demand it. If there
        # is no date header then we can't do anything about expiring
        # the cache.
        elif "date" in response_headers:
            date = calendar.timegm(
                parsedate_tz(response_headers['date'])
            )
            # cache when there is a max-age > 0
            if "max-age" in cc and cc["max-age"] > 0:
                logger.debug("Caching b/c date exists and max-age > 0")
                expires_time = cc['max-age']
>               self.cache.set(
                    cache_url,
                    self.serializer.dumps(request, response, body),
                    expires=expires_time
                )
E               TypeError: set() got an unexpected keyword argument 'expires'
/usr/local/lib/python3.9/site-packages/cachecontrol/controller.py:354: TypeError