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DataHub

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I ran a simple graphql query
```mutation updateDataset($input: DatasetUpdateInput!) {```
it run success in datahub-frontend-react `localhost:9002/api/graphiql` but failed in metadata-service `localhost:8080/api/graphiql` with this log in datahub gms backend. Am I missing something?

Hi <@U02EVNS7ZKJ>, as mentioned in the GraphQL Docs <https://datahubproject.io/docs/api/graphql/overview> you'll need to add a special header to indicate _who_ is making the request

```X-DataHub-Actor: urn:li:corpuser:datahub```

Nonetheless this shouldn't cause an NPE -- we need to address this

Thank you very much <@U01GCJKA8P9>, add X-DataHub-Actor header worked! :smile: Agree on adressing this confusing NPE error.