We have deprecated Rack::SteadyETag

Rack::SteadyETag Show archive.org snapshot was a Rack middleware that generates the same default ETag Show archive.org snapshot for responses that only differ in XOR-masked CSRF tokens or CSP nonces.

We have deprecated Rack::SteadyETag. We instead recommend reconfiguring your Rails app so two requests to the same resource produce the same HTML for a given user.