def test_request_cacheability(self):
res0 = Response(self.request.url, status=200,
headers={'Expires': self.tomorrow})
req0 = Request('http://example.com')
req1 = req0.replace(headers={'Cache-Control': 'no-store'})
req2 = req0.replace(headers={'Cache-Control': 'no-cache'})
with self._middleware() as mw:
# response for a request with no-store must not be cached
res1 = self._process_requestresponse(mw, req1, res0)
self.assertEqualResponse(res1, res0)
self.assertIsNone(mw.storage.retrieve_response(req1))
# Re-do request without no-store and expect it to be cached
res2 = self._process_requestresponse(mw, req0, res0)
self.assertNotIn('cached', res2.flags)
res3 = mw.process_request(req0)
self.assertIn('cached', res3.flags)
self.assertEqualResponse(res2, res3)
# request with no-cache directive must not return cached response
# but it allows new response to be stored
res0b = res0.replace(body='foo')
res4 = self._process_requestresponse(mw, req2, res0b)
self.assertEqualResponse(res4, res0b)
self.assertNotIn('cached', res4.flags)
res5 = self._process_requestresponse(mw, req0, None)
self.assertEqualResponse(res5, res0b)
self.assertIn('cached', res5.flags)
def test_response_cacheability(self):
responses = [
# 304 is not cacheable no matter what servers sends
(False, 304, {}),
(False, 304, {'Last-Modified': self.yesterday}),
(False, 304, {'Expires': self.tomorrow}),
(False, 304, {'Etag': 'bar'}),
(False, 304, {'Cache-Control': 'max-age=3600'}),
# Always obey no-store cache control
(False, 200, {'Cache-Control': 'no-store'}),
(False, 200, {'Cache-Control': 'no-store, max-age=300'}), # invalid
(False, 200, {'Cache-Control': 'no-store', 'Expires': self.tomorrow}), # invalid
# Ignore responses missing expiration and/or validation headers
(False, 200, {}),
(False, 302, {}),
(False, 307, {}),
(False, 404, {}),
# Cache responses with expiration and/or validation headers
(True, 200, {'Last-Modified': self.yesterday}),
(True, 203, {'Last-Modified': self.yesterday}),
(True, 300, {'Last-Modified': self.yesterday}),
(True, 301, {'Last-Modified': self.yesterday}),
(True, 401, {'Last-Modified': self.yesterday}),
(True, 404, {'Cache-Control': 'public, max-age=600'}),
(True, 302, {'Expires': self.tomorrow}),
(True, 200, {'Etag': 'foo'}),
]
with self._middleware() as mw:
for idx, (shouldcache, status, headers) in enumerate(responses):
req0 = Request('http://example-%d.com' % idx)
res0 = Response(req0.url, status=status, headers=headers)
res1 = self._process_requestresponse(mw, req0, res0)
res304 = res0.replace(status=304)
res2 = self._process_requestresponse(mw, req0, res304 if shouldcache else res0)
self.assertEqualResponse(res1, res0)
self.assertEqualResponse(res2, res0)
resc = mw.storage.retrieve_response(req0)
if shouldcache:
self.assertEqualResponse(resc, res1)
self.assertTrue('cached' in res2.flags and res2.status != 304)
else:
self.assertFalse(resc)
self.assertNotIn('cached', res2.flags)
def test_cached_and_stale(self):
sample_data = [
(200, {'Date': self.today, 'Expires': self.yesterday}),
(200, {'Date': self.today, 'Expires': self.yesterday, 'Last-Modified': self.yesterday}),
(200, {'Expires': self.yesterday}),
(200, {'Expires': self.yesterday, 'ETag': 'foo'}),
(200, {'Expires': self.yesterday, 'Last-Modified': self.yesterday}),
(200, {'Expires': self.tomorrow, 'Age': '86405'}),
(200, {'Cache-Control': 'max-age=86400', 'Age': '86405'}),
# no-cache forces expiration, also revalidation if validators exists
(200, {'Cache-Control': 'no-cache'}),
(200, {'Cache-Control': 'no-cache', 'ETag': 'foo'}),
(200, {'Cache-Control': 'no-cache', 'Last-Modified': self.yesterday}),
]
with self._middleware() as mw:
for idx, (status, headers) in enumerate(sample_data):
req0 = Request('http://example-%d.com' % idx)
res0a = Response(req0.url, status=status, headers=headers)
# cache expired response
res1 = self._process_requestresponse(mw, req0, res0a)
self.assertEqualResponse(res1, res0a)
self.assertNotIn('cached', res1.flags)
# Same request but as cached response is stale a new response must
# be returned
res0b = res0a.replace(body='bar')
res2 = self._process_requestresponse(mw, req0, res0b)
self.assertEqualResponse(res2, res0b)
self.assertNotIn('cached', res2.flags)
# Previous response expired too, subsequent request to same
# resource must revalidate and succeed on 304 if validators
# are present
if 'ETag' in headers or 'Last-Modified' in headers:
res0c = res0b.replace(status=304)
res3 = self._process_requestresponse(mw, req0, res0c)
self.assertEqualResponse(res3, res0b)
self.assertIn('cached', res3.flags)
