Try to recreate API-request?

Question

i try to recreate the request for this site: https://www.dolthub.com/repositories/dolthub/ip-to-country

and i try it with this code: (is copied the full payload source content from the network-tab)

import requests import os import sys

if __name__ == '__main__':
  payload = {"operationName":"RowsForDataTableQuery","variables":{"ownerName":"dolthub","repoName":"ip-to-country","refName":"master","tableName":"IPv4ToCountry","revisionType":2},"query":"query RowsForDataTableQuery($ownerName: String!, $repoName: String!, $refName: String!, $revisionType: Float!, $tableName: String!, $pageToken: String) {\n  rows(\n    ownerName: $ownerName\n    repoName: $repoName\n    revisionName: $refName\n    tableName: $tableName\n    revisionType: $revisionType\n    pageToken: $pageToken\n  ) {\n    ...RowListRows\n    __typename\n  }\n}\n\nfragment RowListRows on RowList {\n  nextPageToken\n  prevPageToken\n  list {\n    ...RowForDataTable\n    __typename\n  }\n  __typename\n}\n\nfragment RowForDataTable on Row {\n  columnValues {\n    displayValue\n    __typename\n  }\n  __typename\n}\n"}

  headers =   {
    'access-control-allow-credentials':'true',
    'user-agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36'
  }

  url = "https://www.dolthub.com/graphql"
  resp = requests.post(url,data=payload, headers=headers)
  # resp = requests.post(url,headers=headers)
  print(resp.status_code)
  resp = resp.json() 
  print(resp)

But i allways get this response and error-message when running the code:

400
{'errors': [{'message': 'Variable "$ownerName" of required type "String!" was not provided.', 'locations': [{'line': 1, 'column': 29}], 'extensions': {'code': 'BAD_USER_INPUT'}}, {'message': 'Variable 
"$repoName" of required type "String!" was not provided.', 'locations': [{'line': 1, 'column': 50}], 'extensions': {'code': 'BAD_USER_INPUT'}}, {'message': 'Variable "$refName" of required type "String!" was not provided.', 'locations': [{'line': 1, 'column': 70}], 'extensions': {'code': 'BAD_USER_INPUT'}}, {'message': 'Variable "$revisionType" of required type "Float!" was not provided.', 'locations': [{'line': 1, 'column': 89}], 'extensions': {'code': 'BAD_USER_INPUT'}}, {'message': 'Variable "$tableName" of required type "String!" was not provided.', 'locations': [{'line': 1, 'column': 112}], 
'extensions': {'code': 'BAD_USER_INPUT'}}]}

Why is this not working? There is a ownername for example as string in the payload but i still get the error-message?