No `Authentication-Results` header through API in email workers?

Developers Workers
1

For Workes & Pages, what is the name of the domain?

NA

What is the error number?

NA

What is the error message?

NA

What is the issue or error you’re encountering

If you compare the raw message vs going through the headers API you can see that an Authentication-Results header exists, but it’s not accessible through the headers API

What steps have you taken to resolve the issue?

Parsing manually

What are the steps to reproduce the issue?

  1. Send an email to an email worker, e.g. from gmail
  2. Compare the output of msg.raw vs msg.headers.get('Authentication-Results')

Expected:
You should be able to inspect the Authentication-Results header using the headers API

Actual:
null is returned from msg.headers.get for the Authentication-Results key