Part of the integration of GWC clears areas of the cache based on WFS-T
transactions. You can produce a similar effect in a standalone GWC by
giving it a georss feed.
Anyone up for turning your PostGIS changes into a GeoRSS feed :)
Jody Garnett
On Thu, Aug 21, 2014 at 6:25 AM, Nachtigall, Jens (init) <
jens.nachtig...@init.de> wrote:
> Hi,
>
>
>
> I have a typical setup like:
>
>
>
> PostGIS => GS => GWC => Browser.
>
>
>
>
>
> Can I have preseeded tiles at GeoWebCache that are invalidated (i.e. get
> expired) on the fly based on caching headers?
>
>
>
> That is, is the following possible?:
>
>
>
> 1. Browser re-requests a certain tile including If-Modified-Since header
>
> 2. GWC has a preseeded tile but needs to know if the tile is still valid.
> So GWC passes the request (still with If-Modified-Since) on to GS
>
> 3. GS looks up PostGIS to decide if tile is still valid or not. That is,
> if the data for the requested area has changed. Depending on that finding…
>
> 4. GS answers “304 Not Modified” or gives GWC the freshly generated tile
>
> 5. GWC updates its cache and passes answer along (either “304 Not
> Modified” or new tile)
>
>
>
> I’ve read about Caching with Last-Modified or E-Tag headers at
> http://geowebcache.org/docs/current/services/responseheaders.html#last-modified-and-if-modified-since
>
> However, this only handles the communication between browser and GWC. How
> about the “backend communication” between GS and GWC?
>
>
>
> Best,
>
> Jens
>
>
>
>
>
>
>
>
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