Case sensitivity of authorization header

[brettw1234]

Our request is failing the validate step because our authorization header is in title case. It looks like the validate function is looking for that header in all lower case - req.original.headers['authorization'].

According to the http spec, header names are case-insensitive. Can the validate function be updated to ignore case?

[cmawhorter]

i have a rewrite partially complete that addresses this error too. PR welcome here.