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Flask session does not add Vary: Cookie header when accessed in some ways

Flask session does not add Vary: Cookie header when accessed in some ways: a task in repo2rlenv-cve-patches (Harbor dataset). Title: Flask session does not add Vary: Cookie header when accessed in some ways

The task

**Title:** Flask session does not add `Vary: Cookie` header when accessed in some ways

Part of FineEnvs/repo2rlenv-cve-patches.