Graph API get messages with content type of text

Question

Hi all,

I'm working on a graph API integration where I get and load in messages from Graph API. I've got a minor problem in which the content is always returned in html. 
In the get message documentation (Get message - Microsoft Graph v1.0 | Microsoft Docs) there is a header, 'Prefer: outlook.body-content-type' which allows for the return type to be set to text which makes it easier to extract the content. 
The problem is, when I put this in the header field on an integration I get the following error message: 
The header name Prefer: outlook.body-content-type is not valid. A header name may only contain letters, numbers, and the following special characters ! # $ % & &rsquo;&rsquo; * + - . ^ _ ` | ~

When I try to break the header up it always returns failure. Does anyone know the correct format to put the header name and value pair in?

Thanks in advance

stefanhelzle0001 · Accepted Answer

https://github.com/microsoftgraph/microsoft-graph-docs/issues/4156

tells me

had the same as you because I wrote my header wrong. Try it with this:
Header:

Name: Prefer
Value: outlook.body-content-type="text"

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