curl --request POST \
  --url https://api.ngrok.com/backends/http_response \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'ngrok-version: <ngrok-version>' \
  --data '{
  "description": "<string>",
  "metadata": "<string>",
  "body": "<string>",
  "headers": {},
  "status_code": 123
}'

{
  "id": "<string>",
  "uri": "<string>",
  "created_at": "<string>",
  "description": "<string>",
  "metadata": "<string>",
  "body": "<string>",
  "headers": {},
  "status_code": 123
}