Hi,

thank you. Of course it should not compromise other applications.
Alternatively I could try to use an SLD, which is an optional WMS parameter.
Probably you already had the discussion. It seems that none of the optional 
parameters are actually forwarded to a remote WMS.
Since a GeoTools routine is used in this context 
(org.geotools.coverage.grid.io.AbstractGridCoverage2DReader), I am puzzled and 
don't even know how to hack this, let alone a usable implementation of SLD 
forwarding. In the current doc I read that styling remote layers is not 
possible (as of yet).

Cheers,
Arne



Von: [email protected] [mailto:[email protected]] Im Auftrag von Andrea 
Aime
Gesendet: Freitag, 16. September 2011 17:41
An: Arne Schilling
Cc: [email protected]
Betreff: Re: [Geoserver-devel] Cascaded WMS custom parameters not forwarded

On Fri, Sep 16, 2011 at 3:06 PM, Arne Schilling 
<[email protected]<mailto:[email protected]>> wrote:
Hi,

I have a custom WMS which I want to add as cascaded / remote WMS to GeoServer.
In my workflow I need to forward also custom parameters not known to WMS or 
GeoServer
The WMS I am talking of renders heat maps, a feature that is currently not 
available and describable in OGC service stack. It supports GetMap and 
GetCapabilites requests but requires some additional parameters which are 
currently swallowed by the cascaded WMS feature.
Time available and help appreciated.

Yes, all parameters that are unknown to GeoServer are ignored at the request 
parsing
level and are lost.

I'm also considering a case in which you are cascading multiple wms servers, 
just blindly
sending down all the extra params seems problematic, the same vendor param could
be have a different meaning for the two servers, or one of the might simply 
throw an
exception (though the WMS spec says to ignore the params that are not 
understood).

Cheers
Andrea


--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead

Via Poggio alle Viti 1187
55054  Massarosa (LU)
Italy

phone: +39 0584 962313
fax:      +39 0584 962313

http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
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