One simple way to achieve this would be to write a simple wrapper in a
script that would emit the appropriate headers before spooling the image
to the browser.
-Steve W
Ludwig Max Brinckmann wrote:
I have a map layer reading from a PostGIS database that is being
populated asynchronously through a separate process in the background.
My mapclient displays this data through a WMS request and merges it on
the fly (openlayers-like) with WMS layers coming from other sources.
While most of the layers are static ( i.e. do not change over time), my
PostGIS layer is highly dynamic and displaying up-to-date information is
crucial to the application.
Currently, whenever refreshing the map image, the browser will simply
fetch the image again from the cache, meaning that the viewer displays
old data.
Is there a way in mapserver to set the expiration time of the image
supplied, so that my mapping client would automatically refresh, rather
than reload the old image from the browser cache? (it is good enough for
the application to refresh every time, rather than only when Postgis has
changed, so simply setting the expiry time in the http header would be
great)
Ludwig
