I think, that the mixed format should have mime_type forced to image/jpgpng
Activity
fixing MapServer#247 mixing format and mime_type
jratike80 commentedon Mar 31, 2021
Mapserver, Geoserver and GeoWebCache are using
image/vnd.jpeg-pnghttps://mapserver.gis.umn.edu/ja/mapfile/outputformat.html
https://docs.geoserver.org/latest/en/user/services/wms/outputformats.html
jachym commentedon Mar 31, 2021
Whatever will work
https://github.com/qgis/QGIS/blob/master/src/providers/wms/qgswmsprovider.cpp#L3693
jratike80 commentedon Mar 31, 2021
Then I would go for
image/vnd.jpeg-pngas a common OSGeo variant.jbo-ads commentedon Apr 2, 2021
+1 for
image/vnd.jpeg-png