9f9e0acc55
A new feature toggle, default off, causes the session to be deleted when the user identity on the response does not match the session or request. There are a small number of requests that cause the user present on the session at the time of the request to be a different user by the time of the response. As far as I can tell, these are all cases where a user's browser somehow ends up with a mix of cookies from multiple legitimate login sessions on different accounts on the same device. Because there no longer seems to be any case where this mismatch occurs and where the response should be allowed through, this commit introduces a feature toggle `ENFORCE_SAFE_SESSIONS` which will destroy the active session and overwrite the response. The plan is to make this behavior available in the next named release and permanent in the one after. Also: - Use less fragile method of checking mocked set_attribute calls in tests
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