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)