Sha256: 8d94dc6f6d2d4ff16dbf17b52c1f82f9331157808e63a37d652cca9c55c120a5
Contents?: true
Size: 993 Bytes
Versions: 74
Compression:
Stored size: 993 Bytes
Contents
Caching
=======
Processing and encoding can be an expensive operation. The first time we visit the url,
the image is processed, and there might be a short delay and getting the response.
However, dragonfly apps send `Cache-Control` and `ETag` headers in the response, so we can easily put a caching
proxy like {http://varnish.projects.linpro.no Varnish}, {http://www.squid-cache.org Squid},
{http://tomayko.com/src/rack-cache/ Rack::Cache}, etc. in front of the app, so that subsequent requests are served
super-quickly straight out of the cache.
The file 'dragonfly/rails/images' puts Rack::Cache in front of Dragonfly by default, but for better performance
you may wish to look into something like Varnish.
Given a dragonfly app
app = Dragonfly[:images]
You can configure the 'Cache-Control' header with
app.cache_duration = 3600*24*365*3 # time in seconds
For a well-written discussion of Cache-Control and ETag headers, see {http://tomayko.com/writings/things-caches-do}.
Version data entries
74 entries across 74 versions & 4 rubygems