* +config.action_dispatch.session_store+ sets the name of the store for session data. The default is +:cookie_store+; other valid options include +:active_record_store+, +:mem_cache_store+ or the name of your own custom class.
* +ActionDispatch::Callbacks.before+ takes a block of code to run before the request.
* +ActionDispatch::Callbacks.to_prepare+ takes a block to run after +ActionDispatch::Callbacks.before+, but before the request. Runs for every request in +development+ mode, but only once for +production+ or environments with +cache_classes+ set to +true+.
* +ActionDispatch::Callbacks.after+ takes a block of code to run after the request.
+* +ActionDispatch::Http::URL.tld_length+ sets the TLD (top-level domain) length for the application. Defaults to +1+.
h4. Configuring Action View
There are only a few configuration options for Action View, starting with four on +ActionView::Base+: