curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/hostedextractors/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "externalId": "my.known.id",
  "sourceId": "<string>",
  "config": {
    "topicFilter": "<string>"
  },
  "format": {
    "encoding": "utf8",
    "compression": "gzip"
  },
  "input": {
    "type": "protobuf",
    "messageName": "<string>",
    "files": [
      {
        "fileName": "<string>",
        "content": "<string>"
      }
    ]
  }
}
'

{
  "externalId": "my.known.id",
  "sourceId": "<string>",
  "config": {
    "topicFilter": "<string>"
  },
  "input": {
    "type": "protobuf",
    "messageName": "<string>",
    "files": [
      {
        "fileName": "<string>"
      }
    ]
  },
  "createdTime": 1730204346000,
  "format": {
    "encoding": "utf8",
    "compression": "gzip"
  }
}