Multi-valued email headers

[agroebe]

Hello,

I am working on a service that uses O365 for email automation and I need to ask a specific question about how this library handles multi-valued HTTP headers.

Consider a scenario when I request HTTP headers for messages as such
get_messages(query=mb.q().select('internet_message_headers'))

I am wondering how header dictionaries store multi-valued headers.

Are they comma separated as a string, like so:

{
    'name': 'Some-Header-Name',
    'value': 'first header val, second header val, third header val'
}

OR are they appended to a list, like so:

{
    'name': 'Some-Header-Name',
    'value': [
        'first header val',
        'second header val',
        'third header val'
    ]
}

[alejcas]

Check the MS Graph docs under the internet message headers article.

That will answer your question.