Rack::SteadyETag
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is a Rack middleware that generates the same default
ETag
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for responses that only differ in CSRF tokens or CSP nonces.
By default Rails uses
Rack::ETag
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to generate ETag headers by hashing the response body. In theory this would
enable caching
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for multiple requests to the same resource. However, since most Rails application layouts insert randomly rotating CSRF tokens and CSP nonces into the HTML, two requests for the same content and user will never produce the same response bytes. This means the default ETags from Rails will
never hit a cache
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.
Rack::SteadyETag is a drop-in replacement for Rack::ETag. It excludes random content (like CSRF tokens) from the generated ETag, causing two requests for the same content to usually carry the same ETag.
