I'm reading here:
that GeoServer can accept HTTP Requests as Input when a Raster is required. Documentation states this raster must be "a WCS GetCoverage request or equivalent". (I know is NOT the official documentation but Boundless Server's one, still I feel it applies also to the Open-Source GeoServer)
I need to know if specifying a WMS (as an http URL) can do the job.. ..and hopefully an example.
The test I did with the default GeoServer's "WPS request builder" all failed complaining a proper Input was not found in the provided HTTP Request.