Optionalquery: QueryParamsBuild a fully-qualified URL from a path (on the data host) and optional query.
Optionalquery: QueryParamsGET a path on the data host and parse the JSON reply into T.
Optionalquery: QueryParamsGET a fully-qualified absolute URL (e.g. the catalogue host) and parse JSON into T.
Optionalquery: QueryParamsGET a path on the data host with query params.
Optionalquery: QueryParams
Build a fully-qualified URL from an absolute base URL and optional query.