[Zope] Image Caching
Wed, 12 Jun 2002 20:50:25 +0200
Smith, Neil writes:
> I seem to remember having read something in the list before about problems
> with caching of images, but I can't find it again.
> Is there anything that would cause an image used multiple times on the page
> not to be read from the cache?
> sort of tabbed interface and add new lines to the form without going back to
> the server. This contains a number of very small images that are
> frequently repeated to build up the borders of the tabs etc.
> This works well when used on the LAN, but I've now found that when used
> across the internet, when the form redisplays itself, it takes forever to
> build up the graphics, and you can see each individual image being slowly
> loaded. I'd thought it would have got the images from the cache.
There are many, many parameters that control caching.
See the HTTP/1.1 spec for details.
Maybe, you have caching disabled in your browser?
The spec tells that many responses must not be cached:
* responses to requests with a query string
* responses to post requests
* responses to requests that require authorization (usually not implemented)
* responses with corresponding cache control headers
* responses lacking a "Modified" and "Etag" header
difficult to tell what case prevents caching for you.