Hi,
GeoServer has been traditionally defined these two mime types for SLD 1.0
and 1.1:

    public static final String MIMETYPE_10 = "application/vnd.ogc.sld+xml";
    public static final String MIMETYPE_11 = "application/vnd.ogc.se+xml";

See:
https://github.com/geoserver/geoserver/blob/e893e997434f0ca1b085896e27b1d774f8cafb6a/src/main/src/main/java/org/geoserver/catalog/SLDHandler.java#L66

However, the upcoming OGC Styles API uses:
application/vnd.ogc.sld+xml;version=1.0
application/vnd.ogc.sld+xml;version=1.1

See:
https://github.com/opengeospatial/ogcapi-styles/blob/master/standard/clause_7_styles-api.adoc#requirements-class-ogc-sld-10

The same mimetypes are being used in other places, like the GeoPackage
style extension I'm working on.

Now, the easy change would be to just update the mime types in the
SLDHandler... doing so however may break
REST clients, as those mime types are used also to build MVC converters
based on this API:

https://github.com/geoserver/geoserver/blob/e893e997434f0ca1b085896e27b1d774f8cafb6a/src/main/src/main/java/org/geoserver/catalog/SLDHandler.java#L128

I'd suggest to do the upgrade, but also add a new method,
"alternativeMime(version) -> List<String>" that would return
mime types we keep for backwards compatibility, so that the REST API can
keep on working against existing clients,
without requiring changes.

Opinions?

Cheers
Andrea

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