[dblock]

Summary

Bump the next version to 2.3.0 for this new configuration feature.

Add a config.server_pages block that receives the underlying Rack::ServerPages::Config after the framework applies view_paths. Bots can configure template/static cache policies and other supported page options centrally in an initializer rather than assigning headers inside templates.

The callback is applied when the middleware stack is built, not per request. A later registration replaces the earlier callback; Config.reset! clears it; configuration errors propagate. With no callback, existing view-path behavior and the installed library’s defaults remain unchanged. No dependency minimum, global cache policy, release, or bot deployment is introduced.

Document startup timing, rebuilding cached middleware, library-version requirements for newer options, and an example setting cache_control and static_cache_control. This enables a follow-up to the template-level cache headers in slack-ruby/slack-shellbot#88 once a framework release is available.

Validation

Targeted middleware specs pass with both Mongoid 9.1 and Active Record 8.1 on Ruby 4.0.9 / Grape 4: 7 examples, 0 failures each. Focused lint passes. Regressions cover unchanged defaults, configuration ordering and one-time application, view-path overrides, callback replacement/reset, and explicit errors.

Authored by Copilot (AI), on behalf of @dblock.

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