Extract media metadata

curl --request POST \
  --url https://fluxerusercontent.com/_metadata \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "<string>",
  "url": "<string>",
  "isNSFWAllowed": true,
  "with_base64": true
}
'

{
  "format": "<string>",
  "content_type": "<string>",
  "content_hash": "<string>",
  "size": 123,
  "nsfw": true,
  "width": 123,
  "height": 123,
  "duration": 123,
  "placeholder": "<string>",
  "base64": "<string>",
  "animated": true,
  "nsfw_probability": 123,
  "nsfw_predictions": {}
}