In JavaScript file I'm using REST to communicate with Office 365 APIs for mail, I'm getting the messages but nothing about the message's ContentBytes, since I need to save the message (email) in file with eml extension.
The code is:
 var messageEndpoint = "https://outlook.office.com/api/v2.0/me/messages/" + mailId + "/attachments";
    $.ajax({
        type: "GET",
        url: messageEndpoint,
        headers: {
            'Authorization': 'Bearer ' + outlookToken,
        },
        success: function (messageResponse) {  }
"messageResponse" has the message properties( like: from, to, body, etc.) but not the Content Bytes.
Anybody has idea how to convert the Office 365 mail messages REST response to byte [] then to save it in file ?
Thanks