Export Dashboard via rest api

Good one every one,
Can any1 spot which is the problem on the following code?, trying to test how GoodData exports a dashboard to a PDF.

def post_request(url, data):
  response = requests.post(
  url,
  data=data,
  headers={'Authorization': 'Bearer ' + auth_token,
  'Content-type': 'application/json'}
  , timeout=30
)

result = post_request(
  HOST_URL + '/api/v1/actions/workspaces/' + WORKSPACE_ID + '/export/visual',
  data={
    "dashboardId": DASHBOARD_ID,
    "fileName": "export_test_01",
    "metadata": {}
  }
)

it's returning No API path found that matches request.

Just in case some1 is wondering, token is good as I'm able to retrieve from endpoint '/api/v1/entities/workspaces' the workspaces, but when trying to perform the post above it's not working.