class CustomHeader(AWSProperty):
    """
    `CustomHeader <http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cloudfront-responseheaderspolicy-customheader.html>`__
    """

    props: PropsDictType = {
        "Header": (str, True),
        "Override": (boolean, True),
        "Value": (str, True),
    }

troposphere.cloudfront.CustomHeader(Header="Cache-Policy", Value="no-cache")

Yields this error in validation: ValueError("Resource Override required in type <unknown type>")

A couple things wrong with this:

Override is not a Resource, its an attribute (not ideal, but I believe this is because its used for validating Resources primarily)
and how am I supposed to find ?

My proposal:

instead of falling back to we should fall back to the classname.

e.g. error would be this instead: ValueError("Resource Override required in type <class 'troposphere.cloudfront.CustomHeader'>")

My one liner PR for the change: https://github.com/cloudtools/troposphere/pull/2019

cloudtools / troposphere

Confusing/missleading error messages around required attributes for some types (resource_type not defined) #2020

A couple things wrong with this:

My proposal: