[mapserver-users] enabling browser cache from Mapcache?

Thu May 31 02:49:05 PDT 2018

Hi,

However, if client like OpenLayers or Leaflet is making 256x256 sized WMS requests they are always the same for the same tile and thus cacheable as well.

-Jukka Rahkonen-

Lähettäjä: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta Yves Jacolin
Lähetetty: 31. toukokuuta 2018 10:08
Vastaanottaja: Dan Little <theduckylittle at gmail.com>
Kopio: mapserver-users <mapserver-users at lists.osgeo.org>; Mark Volz <MarkVolz at co.lyon.mn.us>
Aihe: Re: [mapserver-users] enabling browser cache from Mapcache?

Dan,

> 1. No, you are not correct. The browser CAN cache those requests.
Hum, in wms mode? I am not sure. In WMTS, TMS, etc mode yes but not in WMS as the request will change each time.
Y.

2018-05-30 19:15 GMT+02:00 Dan Little <theduckylittle at gmail.com<mailto:theduckylittle at gmail.com>>:
Please take a moment to do a bit more reading about how browser caching works:
- https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching

You cannot directly control what the browser chooses to cache but you can use mod_expiry and friendly-reusable URLs (like XYZ tiles) to help in that cause.  Repetitive WMS requests will be caught by the cache but it's much harder to get a hit as it will change when the screen size, resolution, or small shifts in locations differ.

To directly answer your questions:
1. No, you are not correct. The browser CAN cache those requests.
2. Yes, the browser will cache those images.

Cheers.

On Wed, May 30, 2018 at 11:41 AM Mark Volz <MarkVolz at co.lyon.mn.us<mailto:MarkVolz at co.lyon.mn.us>> wrote:
Hello,

Using Apache, I would like to know if it is possible to set up a browser cache for images from mapcache so that images are stored on the client machine instead of having to get resent from the server.  I enabled mod_expires and noticed that the png files for the buttons are cached unfortunately the mapcache png files are not cached.  I presume it might not be possible to cache images from mapcache when used in WMS mode, but it might be possible when using either WMTS, or TMS mode.

Questions:

1.       Am I correct that we cannot use browser or client caching with mapcache in wms mode?

2.       Can we use browser cache when using WMTS or TMS services?

I am using GeoMOOSE which should be able to consume xyz TMS tiles.

Thanks!

Sincerely,
Mark Volz, GISP
Lyon County GIS Coordinator

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