{ "number": {imagenumber}, "total": {totalimages}, "isvalid": yes "URL": {imageURL}
{ "number": 0, "total": {totalimages}, "isvalid": no "URL": https://i.awoo.ml/404.png}
"isvalid" is set on whether or not "number" is in range of "total"
"isvalid"
"number"
"total"