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requests-cache · Jun 5, 2023 · 127cebf · 127cebf
1 parent f108ce7
commit 127cebf
Showing 1 changed file with 11 additions and 5 deletions.
diff --git a/requests_cache/policy/actions.py b/requests_cache/policy/actions.py
@@ -299,11 +299,17 @@ def _validate_vary(
         # Generate a secondary cache key based on Vary for both the cached request and new request.
         # If there are redirects, compare the new request against the last request in the chain.
         key_kwargs['match_headers'] = [k.strip() for k in vary.split(',')]
-        vary_request = (
-            cached_response.history[-1].request
-            if cached_response.history
-            else cached_response.request
-        )
+
+        try:
+            vary_request = (
+                cached_response.history[-1].request
+                if cached_response.history
+                else cached_response.request
+            )
+        # Bug with python<=3.8: Somehow history is still dicts, i.e. the cattrs structure hook fails
+        except AttributeError:
+            vary_request = CachedResponse.from_response(cached_response.history[-1]).request
+
         vary_cache_key = create_key(vary_request, **key_kwargs)
         headers_match = create_key(self._request, **key_kwargs) == vary_cache_key
         if not headers_match: