[mapserver-users] WFS OUTPUTFORMAT and application/json

[Seth G]

Thanks to both of you for your replies. 
The main reason to use "application/json" was to avoid making changes to a JavaScript client that remains GeoServer/MapServer neutral. 

The hint to look at the outputFormats in http://localhost/mapserver/?&version=1.1.0&service=WFS&request=getcapabilities was useful. 

It appears a client can use either the OUTPUTFORMAT NAME or MIMETYPE to send in the OUTPUTFORMAT parameter of a querystring. 

<ows:Parameter name="outputFormat">
<ows:Value>text/xml; subtype=gml/3.1.1</ows:Value>
<ows:Value>shapezip</ows:Value>
<ows:Value>dbfzip</ows:Value>
<ows:Value>spatialite</ows:Value>
<ows:Value>application/json; subtype=geojson</ows:Value>
</ows:Parameter>

To resolve the issue I could simply remove the subtype from the mime-type (which was incorrect anyway according to https://sgillies.net/2014/05/22/the-geojson-media-type.html). 

The final working OUTPUTFORMAT is:

  OUTPUTFORMAT
    NAME "application/json"
    DRIVER "OGR/GEOJSON"
    MIMETYPE "application/json"
    FORMATOPTION "FORM=SIMPLE"
    FORMATOPTION "STORAGE=memory"
  END
  
  WEB
    METADATA
        ..
        "wfs_getfeature_formatlist" "gml,geojson,shapezip,dbfzip,spatialite,application/json"
        ..

--
web:http://geographika.co.uk
twitter: @geographika

On Thu, Dec 20, 2018, at 9:14 AM, Rahkonen Jukka (MML) wrote:
> Hi,
> 
> We use outputformat as follows. The mimetype is what is written to 
> GetCapabilities, in our case
> <GetFeatureInfo><Format>application/json</Format>
> OGC service clients are supposed to use that as the format name. The 
> problem that you have by using "application/json" as a name may be a bug 
> but you can avoid it by using some other name. If you want to support 
> both "application/json" and  "application/json; subtype=geojson" you 
> must write two outputformats.
> 
> OUTPUTFORMAT
>   NAME "geojson"
>   MIMETYPE "application/json"
>   DRIVER "TEMPLATE"
>   FORMATOPTION " geojson_template.js"
> END
> 
> -Jukka Rahkonen-
> 
> -----Alkuperäinen viesti-----
> Lähettäjä: mapserver-users 
> [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta Seth G
> Lähetetty: 20. joulukuuta 2018 0:28
> Vastaanottaja: mapserver-users at lists.osgeo.org
> Aihe: [mapserver-users] WFS OUTPUTFORMAT and application/json
> 
> Hi list,
> 
> Has anyone run into the following issue with using "application/json" in 
> an OUTPUTFORMAT NAME as follows?
> 
>   OUTPUTFORMAT
>     NAME "application/json"
>     DRIVER "OGR/GEOJSON"
>     MIMETYPE "application/json; subtype=geojson"
>     FORMATOPTION "FORM=SIMPLE"
>     FORMATOPTION "STORAGE=memory"
>   END  
> 
> Then a request such as below:
> 
> http://localhost/mapserver/?&SERVICE=WFS&REQUEST=GetFeature&VERSION=1.1.0&OUTPUTFORMAT=application/json&TYPENAME=layer&SRSNAME=EPSG:3857
> 
> Causes the following error:
> 
> msWFSGetFeature(): WFS server error. OUTPUTFORMAT 'application/json' 
> does not have IMAGEMODE FEATURE, and is not permitted for WFS output.
> 
> Adding a IMAGEMODE FEATURE (or RGBA) doesn't resolve the issue. 
> I thought it may have been an issue with the slash in the NAME, but this 
> works in other cases. Changing NAME to "geojson" also works fine, but 
> I'm wondering why this occurs. GeoServer and TinyOWS both use 
> "application/json" so it would be good if it worked for MapServer also. 
> 
> 
> Seth
> 
> 
> --
> web:http://geographika.co.uk
> twitter: @geographika
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