Trond

Man I had hoped that if my name was going to be used for something it'd be for good. That hope has been shattered.

I had to educate myself as to what "Warnocked" means to ensure that I was not in some means being implicated here. *sigh* I'm now an innocent pariah.

;)

Fred [Warnock!]

Trond Michelsen wrote:
No takers? I feel like I'm being Warnocked here :)

I really hope the silence isn't an indication that the question is too
stupid. Getting blank images instead of an error message is actually a
big problem with my server configuration, as I'm caching all responses
with an image/* content-type.

On Tue, Nov 06, 2007 at 05:35:17PM +0100, Trond Michelsen wrote:
In my mapfile, I have several layers with connectiontype WMS. Once in
a while, the WMS-servers that deliver these layers will fail, usually
due to high load, and return an application/vnd.ogc.se_xml
exception. In these cases, I'd like mapserver to return an exception
as well, but instead, mapserver will just log the error message in
MS_ERRORFILE, and continue drawing the rest of the layers. If there
are no more layers, it will result in a blank image.

(BTW: I've also noticed the same behaviour if the remote wms-server
answers with an internal server error)

Here's the layer definition that I use for testing. exception.cgi will
always return a dummy XML exception.

LAYER
    NAME "exception"
    TYPE RASTER
    STATUS ON
    CONNECTION "http://wms1.oslo.dnmi.no/cgi-bin/exception.cgi";
    CONNECTIONTYPE WMS
    OFFSITE 255 255 254
    METADATA
      "wms_srs"               "EPSG:4326"
      "wms_name"              "exception"
      "wms_server_version"    "1.1.1"
      "wms_formatlist"        "image/png"
      "wms_format"            "image/png"
      "wms_exceptions_format" "application/vnd.ogc.se_xml"
    END #metadata
END #layer

Is there something I can do to force mapserver to fail, and return an
exception if it fails to draw any of the wms-layers?

I'm using mapserver 4.10

$ cgi-bin/mapserv -v
MapServer version 4.10.0 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP 
OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER 
SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER 
SUPPORTS=THREADS SUPPORTS=GEOS INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR INPUT=GDAL 
INPUT=SHAPEFILE DEBUG=MSDEBUG


--
Trond Michelsen


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