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elaborate on how web server configuration to check for static files o…

…n disk enables page caching to work without hitting the app server stack
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1 parent 8c11038 commit eccd5cb6108a7bbddffd8d97be46d4ee06cac150 @mjankowski mjankowski committed Jun 26, 2011
Showing with 4 additions and 3 deletions.
  1. +4 −3 actionpack/lib/action_controller/caching/pages.rb
@@ -16,9 +16,10 @@ module Caching
# caches_page :show, :new
# end
- # This will generate cache files such as <tt>weblog/show/5.html</tt> and <tt>weblog/new.html</tt>,
- # which match the URLs used to trigger the dynamic generation. This is how the web server is able
- # pick up a cache file when it exists and otherwise let the request pass on to Action Pack to generate it.
+ # This will generate cache files such as <tt>weblog/show/5.html</tt> and <tt>weblog/new.html</tt>, which match the URLs used
+ # that would normally trigger dynamic page generation. Page caching works by configuring a web server to first check for the
+ # existence of files on disk, and to serve them directly when found, without passing the request through to Action Pack.
+ # This is much faster than handling the full dynamic request in the usual way.
# Expiration of the cache is handled by deleting the cached file, which results in a lazy regeneration approach where the cache
# is not restored before another hit is made against it. The API for doing so mimics the options from +url_for+ and friends:

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