diff options
Diffstat (limited to 'actionpack/lib/action_dispatch/http/cache.rb')
| -rw-r--r-- | actionpack/lib/action_dispatch/http/cache.rb | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/actionpack/lib/action_dispatch/http/cache.rb b/actionpack/lib/action_dispatch/http/cache.rb index 30ade14c26..4bd727c14e 100644 --- a/actionpack/lib/action_dispatch/http/cache.rb +++ b/actionpack/lib/action_dispatch/http/cache.rb @@ -80,9 +80,17 @@ module ActionDispatch set_header DATE, utc_time.httpdate end + # This method allows you to set the ETag for cached content, which + # will be returned to the end user. + # + # By default, Action Dispatch sets all ETags to be weak. + # This ensures that if the content changes only semantically, + # the whole page doesn't have to be regenerated from scratch + # by the web server. With strong ETags, pages are compared + # byte by byte, and are regenerated only if they are not exactly equal. def etag=(etag) key = ActiveSupport::Cache.expand_cache_key(etag) - super %("#{Digest::MD5.hexdigest(key)}") + super %(W/"#{Digest::MD5.hexdigest(key)}") end def etag?; etag; end @@ -91,7 +99,7 @@ module ActionDispatch DATE = 'Date'.freeze LAST_MODIFIED = "Last-Modified".freeze - SPECIAL_KEYS = Set.new(%w[extras no-cache max-age public must-revalidate]) + SPECIAL_KEYS = Set.new(%w[extras no-cache max-age public private must-revalidate]) def cache_control_segments if cache_control = _cache_control |