Krukov
Fix IndexError in CacheEtagMiddleware
Fixes #297
Fix IndexError in CacheEtagMiddleware
The _is_early_cache() function in FastAPI middleware would raise an IndexError when processing empty lists. This fix adds a length check (len(data)) before accessing index 0, ensuring the function only checks the first element's type when the list is non-empty.
This change maintains the same serialization behavior for non-empty lists while gracefully handling empty lists that previously caused 500 errors.
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