{
  "$schema": "https://www.atsc-schemas.org/atsc3.0/a344/20260218/org.atsc.CacheRequest-request.json",
    "jsonrpc": "2.0",
    "method": "org.atsc.CacheRequest",
    "params": {
      "sourceURL": "https://foo.com/service1/", 
      "targetURL": "images/",
      "URLs":["A/big-image1.png","B/big-image2.png","C/big-image3.png"]
    },
    "id": 37
  }