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Convex Hull (GeometryServer)

{
 "geometryType": "esriGeometryPolygon",
 "geometry": {"rings": [[
  [
   -116,
   33
  ],
  [
   -117,
   34
  ],
  [
   -116.5,
   34.5
  ],
  [
   -116,
   33
  ]
 ]]}
}