curl --request POST \
  --url https://api.example.com/api/v2/external/execution/streaming/start \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>",
  "nbcode": 0,
  "timeout": 60,
  "requirements_content": "<string>",
  "prior_imports": [
    "<string>"
  ],
  "kernel_state": "<string>",
  "import_files": "<string>",
  "file_name": "<string>",
  "execution_type": "gpu.l40s",
  "user_callback_urls": [
    "<string>"
  ]
}
'

{
  "execution_id": "<string>",
  "status": "<string>",
  "streaming_url": "<string>"
}