Calling auth webhook from Heroku instance with Authorization header returns correct X-Hasura-User-Id and X-Hasura-Role from GraphiQL page.

However a call to the same webhook URL from docker instance on Ubuntu 16.04 server gives me this error and can't get correct X-Hasura headers sent back.

{
"errors": [
{
"path": "$",
"error": "HTTP Exception from Webhook",
"code": "unexpected"
}
]
}

webhook URL used: https://us-central1-vue-hasura-auth.cloudfunctions.net/hasuraWebhook