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I'm trying use GetPrint request with QGIS Server and I find feature that you can assign value of function to label (with id) ex.

http://qgis.local/cgi-bin/qgis_mapserv.fcgi?MAP=/home/mario/wms.qgs&VERSION=1.3.0&SERVICE=WMS&SRS=EPSG:4326&REQUEST=GetPrint&LAYERS=wms&STYLES=&FORMAT=png&TEMPLATE=Template1&field1=[%25 now() %25]

Result of GetPrint request with function in label expression

From QGIS 2.8 there is possibility to make your own function so I try with built-in custom function func(value1)

http://qgis.local/cgi-bin/qgis_mapserv.fcgi?MAP=/home/mario/wms.qgs&VERSION=1.3.0&SERVICE=WMS&SRS=EPSG:4326&REQUEST=GetPrint&LAYERS=wms&STYLES=&FORMAT=png&TEMPLATE=Template1&field1=[%25 func('a') %25] Result of GetPrint request with custom function in label expression

Is there way to make it work?

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The custom registered functions don't get propagated at the server level. One way to make the server know about your custom function is to write a server plugin and register your expression in the class factory.

More details here: http://osgeo-org.1560.x6.nabble.com/QGIS-Developer-Custom-python-expressions-in-QGIS-Server-td5362875.html

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